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fs/jfs/jfs_dinode.h
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/* SPDX-License-Identifier: GPL-2.0-or-later */ |
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/* |
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* Copyright (C) International Business Machines Corp., 2000-2001 |
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*/ #ifndef _H_JFS_DINODE #define _H_JFS_DINODE /* |
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* jfs_dinode.h: on-disk inode manager |
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*/ |
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#define INODESLOTSIZE 128 #define L2INODESLOTSIZE 7 #define log2INODESIZE 9 /* log2(bytes per dinode) */ |
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/* |
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* on-disk inode : 512 bytes |
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* * note: align 64-bit fields on 8-byte boundary. */ struct dinode { /* |
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* I. base area (128 bytes) * ------------------------ |
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* * define generic/POSIX attributes */ __le32 di_inostamp; /* 4: stamp to show inode belongs to fileset */ __le32 di_fileset; /* 4: fileset number */ __le32 di_number; /* 4: inode number, aka file serial number */ __le32 di_gen; /* 4: inode generation number */ pxd_t di_ixpxd; /* 8: inode extent descriptor */ __le64 di_size; /* 8: size */ __le64 di_nblocks; /* 8: number of blocks allocated */ __le32 di_nlink; /* 4: number of links to the object */ __le32 di_uid; /* 4: user id of owner */ __le32 di_gid; /* 4: group id of owner */ __le32 di_mode; /* 4: attribute, format and permission */ struct timestruc_t di_atime; /* 8: time last data accessed */ struct timestruc_t di_ctime; /* 8: time last status changed */ struct timestruc_t di_mtime; /* 8: time last data modified */ struct timestruc_t di_otime; /* 8: time created */ dxd_t di_acl; /* 16: acl descriptor */ dxd_t di_ea; /* 16: ea descriptor */ __le32 di_next_index; /* 4: Next available dir_table index */ __le32 di_acltype; /* 4: Type of ACL */ /* |
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* Extension Areas. |
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* |
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* Historically, the inode was partitioned into 4 128-byte areas, * the last 3 being defined as unions which could have multiple * uses. The first 96 bytes had been completely unused until * an index table was added to the directory. It is now more * useful to describe the last 3/4 of the inode as a single * union. We would probably be better off redesigning the * entire structure from scratch, but we don't want to break * commonality with OS/2's JFS at this time. |
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*/ union { struct { /* * This table contains the information needed to * find a directory entry from a 32-bit index. * If the index is small enough, the table is inline, * otherwise, an x-tree root overlays this table */ struct dir_table_slot _table[12]; /* 96: inline */ dtroot_t _dtroot; /* 288: dtree root */ } _dir; /* (384) */ #define di_dirtable u._dir._table #define di_dtroot u._dir._dtroot |
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#define di_parent di_dtroot.header.idotdot |
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#define di_DASD di_dtroot.header.DASD struct { union { u8 _data[96]; /* 96: unused */ struct { void *_imap; /* 4: unused */ __le32 _gengen; /* 4: generator */ } _imap; } _u1; /* 96: */ #define di_gengen u._file._u1._imap._gengen union { xtpage_t _xtroot; struct { u8 unused[16]; /* 16: */ dxd_t _dxd; /* 16: */ union { __le32 _rdev; /* 4: */ |
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/* * The fast symlink area * is expected to overflow * into _inlineea when * needed (which will clear * INLINEEA). */ |
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u8 _fastsymlink[128]; } _u; u8 _inlineea[128]; } _special; } _u2; } _file; #define di_xtroot u._file._u2._xtroot #define di_dxd u._file._u2._special._dxd #define di_btroot di_xtroot #define di_inlinedata u._file._u2._special._u #define di_rdev u._file._u2._special._u._rdev #define di_fastsymlink u._file._u2._special._u._fastsymlink |
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#define di_inlineea u._file._u2._special._inlineea |
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} u; }; /* extended mode bits (on-disk inode di_mode) */ |
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#define IFJOURNAL 0x00010000 /* journalled file */ #define ISPARSE 0x00020000 /* sparse file enabled */ #define INLINEEA 0x00040000 /* inline EA area free */ |
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#define ISWAPFILE 0x00800000 /* file open for pager swap space */ /* more extended mode bits: attributes for OS/2 */ #define IREADONLY 0x02000000 /* no write access to file */ |
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#define IHIDDEN 0x04000000 /* hidden file */ |
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#define ISYSTEM 0x08000000 /* system file */ |
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#define IDIRECTORY 0x20000000 /* directory (shadow of real bit) */ |
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#define IARCHIVE 0x40000000 /* file archive bit */ #define INEWNAME 0x80000000 /* non-8.3 filename format */ #define IRASH 0x4E000000 /* mask for changeable attributes */ |
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#define ATTRSHIFT 25 /* bits to shift to move attribute specification to mode position */ |
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/* extended attributes for Linux */ #define JFS_NOATIME_FL 0x00080000 /* do not update atime */ #define JFS_DIRSYNC_FL 0x00100000 /* dirsync behaviour */ #define JFS_SYNC_FL 0x00200000 /* Synchronous updates */ #define JFS_SECRM_FL 0x00400000 /* Secure deletion */ #define JFS_UNRM_FL 0x00800000 /* allow for undelete */ #define JFS_APPEND_FL 0x01000000 /* writes to file may only append */ #define JFS_IMMUTABLE_FL 0x02000000 /* Immutable file */ #define JFS_FL_USER_VISIBLE 0x03F80000 #define JFS_FL_USER_MODIFIABLE 0x03F80000 #define JFS_FL_INHERIT 0x03C80000 /* These are identical to EXT[23]_IOC_GETFLAGS/SETFLAGS */ #define JFS_IOC_GETFLAGS _IOR('f', 1, long) #define JFS_IOC_SETFLAGS _IOW('f', 2, long) |
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#define JFS_IOC_GETFLAGS32 _IOR('f', 1, int) #define JFS_IOC_SETFLAGS32 _IOW('f', 2, int) |
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#endif /*_H_JFS_DINODE */ |