/* * Copyright 2001-2017, Axel Dörfler, axeld@pinc-software.de. * Copyright 2020, Shubham Bhagat, shubhambhagat111@yahoo.com * All rights reserved. Distributed under the terms of the MIT License. */ /* *Important: *All fields in XFS metadata structures are in big-endian byte order *except for log items which are formatted in host order. * *This file contains all global structure definitions. */ #ifndef _XFS_SB_H_ #define _XFS_SB_H_ #include "system_dependencies.h" #include "xfs_types.h" extern fs_vnode_ops gxfsVnodeOps; extern fs_volume_ops gxfsVolumeOps; #define XFS_SB_MAGIC 0x58465342 #define XFS_MIN_BLOCKSIZE_LOG 9 #define XFS_MAX_BLOCKSIZE_LOG 16 #define XFS_MIN_BLOCKSIZE (1 << XFS_MIN_BLOCKSIZE_LOG) #define XFS_MAX_BLOCKSIZE (1 << XFS_MAX_BLOCKSIZE_LOG) #define XFS_MIN_CRC_BLOCKSIZE (1 << (XFS_MIN_BLOCKSIZE_LOG + 1)) #define XFS_MIN_SECTORSIZE_LOG 9 #define XFS_MAX_SECTORSIZE_LOG 15 #define XFS_MIN_SECTORSIZE (1 << XFS_MIN_SECTORSIZE_LOG) #define XFS_MAX_SECTORSIZE (1 << XFS_MAX_SECTORSIZE_LOG) #define XFS_SB_MAXSIZE 512 #define XFS_OPEN_MODE_USER_MASK 0x7fffffff #define XFS_SB_VERSION_NUMBITS 0x000f #define XFS_SB_VERSION_ALLFBITS 0xfff0 /* B+Tree related macros */ #define XFS_BMAP_MAGIC 0x424d4150 #define XFS_BMAP_CRC_MAGIC 0x424d4133 #define MAX_TREE_DEPTH 5 #define XFS_KEY_SIZE sizeof(xfs_fileoff_t) #define XFS_PTR_SIZE sizeof(xfs_fsblock_t) struct file_cookie { bigtime_t last_notification; off_t last_size; int open_mode; }; class XfsSuperBlock { public: bool IsValid() const; bool IsValidVersion() const; bool IsValidFeatureMask() const; bool IsVersion5() const; bool XfsHasIncompatFeature() const; bool UuidEquals(const uuid_t& u1); const char* Name() const; uint32 BlockSize() const; uint8 BlockLog() const; uint32 DirBlockSize() const; // maximum 65536 uint32 DirBlockLog() const; uint8 AgInodeBits() const; uint8 InodesPerBlkLog() const; uint8 AgBlocksLog() const; xfs_rfsblock_t TotalBlocks() const; xfs_rfsblock_t TotalBlocksWithLog() const; uint64 FreeBlocks() const; uint64 UsedBlocks() const; uint32 Size() const; uint16 InodeSize() const; void SwapEndian(); xfs_ino_t Root() const; xfs_agnumber_t AgCount() const; xfs_agblock_t AgBlocks() const; uint8 Flags() const; uint16 Version() const; uint32 Features2() const; uint32 Crc() const; uint32 MagicNum() const; static size_t Offset_crc() { return offsetof(XfsSuperBlock, sb_crc);} private: uint32 sb_magicnum; uint32 sb_blocksize; xfs_rfsblock_t sb_dblocks; xfs_rfsblock_t sb_rblocks; xfs_rtblock_t sb_rextents; uuid_t sb_uuid; xfs_fsblock_t sb_logstart; xfs_ino_t sb_rootino; xfs_ino_t sb_rbmino; xfs_ino_t sb_rsumino; xfs_agblock_t sb_rextsize; xfs_agblock_t sb_agblocks; xfs_agnumber_t sb_agcount; xfs_extlen_t sb_rbmblocks; xfs_extlen_t sb_logblocks; uint16 sb_versionnum; uint16 sb_sectsize; uint16 sb_inodesize; uint16 sb_inopblock; char sb_fname[12]; uint8 sb_blocklog; uint8 sb_sectlog; uint8 sb_inodelog; uint8 sb_inopblog; uint8 sb_agblklog; uint8 sb_rextslog; uint8 sb_inprogress; uint8 sb_imax_pct; uint64 sb_icount; uint64 sb_ifree; uint64 sb_fdblocks; uint64 sb_frextents; xfs_ino_t sb_uquotino; xfs_ino_t sb_gquotino; uint16 sb_qflags; uint8 sb_flags; uint8 sb_shared_vn; xfs_extlen_t sb_inoalignmt; uint32 sb_unit; uint32 sb_width; uint8 sb_dirblklog; uint8 sb_logsectlog; uint16 sb_logsectsize; uint32 sb_logsunit; uint32 sb_features2; uint32 sb_bad_features2; // version 5 uint32 sb_features_compat; uint32 sb_features_ro_compat; uint32 sb_features_incompat; uint32 sb_features_log_incompat; uint32 sb_crc; private: xfs_extlen_t sb_spino_align; xfs_ino_t sb_pquotino; xfs_lsn_t sb_lsn; uuid_t sb_meta_uuid; }; /* *These flags indicate features introduced over time. * *If the lower nibble of sb_versionnum >=4 then the following features are *checked. If it's equal to 5, it's version 5. */ #define XFS_SB_VERSION_SHAREDBIT 0x0200 #define XFS_SB_VERSION_EXTFLGBIT 0x1000 #define XFS_SB_VERSION_DIRV2BIT 0x2000 #define XFS_SB_VERSION_MOREBITSBIT 0x4000 #define XFS_SB_VERSION_OKBITS \ ((XFS_SB_VERSION_NUMBITS | XFS_SB_VERSION_ALLFBITS) & \ ~XFS_SB_VERSION_SHAREDBIT) /* Superblock quota flags - sb_qflags */ #define XFS_OQUOTA_ENFD 0x0010 #define XFS_OQUOTA_CHKD 0x0020 #define XFS_GQUOTA_ENFD 0x0080 #define XFS_GQUOTA_CHKD 0x0100 #define XFS_PQUOTA_ENFD 0x0200 #define XFS_PQUOTA_CHKD 0x0400 /* Extended v4 Superblock flags - sb_features2 */ #define XFS_SB_VERSION2_LAZYSBCOUNTBIT 0x00000001 // update global free space and inode on clean unmount #define XFS_SB_VERSION2_ATTR2BIT 0x00000002 // optimises the inode layout of ext-attr #define XFS_SB_VERSION2_PROJID32BIT 0x00000080 /* 32-bit project id */ #define XFS_SB_VERSION2_FTYPE 0x00000200 #define XFS_SB_VERSION2_OKBITS \ (XFS_SB_VERSION2_LAZYSBCOUNTBIT | \ XFS_SB_VERSION2_ATTR2BIT | \ XFS_SB_VERSION2_PROJID32BIT | \ XFS_SB_VERSION2_FTYPE) /* Extended Version 5 Superblock Read-Only compatibility flags */ #define XFS_SB_FEAT_RO_COMPAT_FINOBT (1 << 0) /* free inode btree */ #define XFS_SB_FEAT_RO_COMPAT_RMAPBT (1 << 1) /* reverse map btree */ #define XFS_SB_FEAT_RO_COMPAT_REFLINK (1 << 2) /* reflinked files */ #define XFS_SB_FEAT_RO_COMPAT_INOBTCNT (1 << 3) /* inobt block counts */ /* Extended Version 5 Superblock Read-Write incompatibility flags */ #define XFS_SB_FEAT_INCOMPAT_FTYPE (1 << 0) /* filetype in dirent */ #define XFS_SB_FEAT_INCOMPAT_SPINODES (1 << 1) /* sparse inode chunks */ #define XFS_SB_FEAT_INCOMPAT_META_UUID (1 << 2) /* metadata UUID */ #define XFS_SB_FEAT_INCOMPAT_BIGTIME (1 << 3) /* large timestamps */ #define XFS_SB_FEAT_INCOMPAT_NEEDSREPAIR (1 << 4) /* needs xfs_repair */ #define XFS_SB_FEAT_INCOMPAT_NREXT64 (1 << 5) /* large extent counters */ #define XFS_SB_FEAT_INCOMPAT_EXCHRANGE (1 << 6) /* exchangerange supported */ #define XFS_SB_FEAT_INCOMPAT_PARENT (1 << 7) /* parent pointers */ #define XFS_SB_FEAT_INCOMPAT_METADIR (1 << 8) /* metadata dir tree */ #define XFS_SB_FEAT_INCOMPAT_ZONED (1 << 9) /* zoned RT allocator */ #define XFS_SB_FEAT_INCOMPAT_ZONE_GAPS (1 << 10) /* RTGs have LBA gaps */ /* Extended v5 superblock feature masks. These are to be used for new v5 superblock features only. */ #define XFS_SB_FEAT_COMPAT_ALL 0 #define XFS_SB_FEAT_COMPAT_UNKNOWN ~XFS_SB_FEAT_COMPAT_ALL #define XFS_SB_FEAT_RO_COMPAT_ALL \ (XFS_SB_FEAT_RO_COMPAT_FINOBT | \ XFS_SB_FEAT_RO_COMPAT_RMAPBT | \ XFS_SB_FEAT_RO_COMPAT_REFLINK| \ XFS_SB_FEAT_RO_COMPAT_INOBTCNT) #define XFS_SB_FEAT_RO_COMPAT_UNKNOWN ~XFS_SB_FEAT_RO_COMPAT_ALL #define XFS_SB_FEAT_INCOMPAT_ALL \ (XFS_SB_FEAT_INCOMPAT_FTYPE | XFS_SB_FEAT_INCOMPAT_SPINODES | XFS_SB_FEAT_INCOMPAT_META_UUID \ | XFS_SB_FEAT_INCOMPAT_BIGTIME | XFS_SB_FEAT_INCOMPAT_NEEDSREPAIR \ | XFS_SB_FEAT_INCOMPAT_NREXT64 | XFS_SB_FEAT_INCOMPAT_EXCHRANGE \ | XFS_SB_FEAT_INCOMPAT_PARENT | XFS_SB_FEAT_INCOMPAT_METADIR | XFS_SB_FEAT_INCOMPAT_ZONED \ | XFS_SB_FEAT_INCOMPAT_ZONE_GAPS) #define XFS_SB_FEAT_INCOMPAT_UNKNOWN ~XFS_SB_FEAT_INCOMPAT_ALL
