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Diffstat (limited to 'fs/jfs/jfs_dinode.h')
| -rw-r--r-- | fs/jfs/jfs_dinode.h | 169 |
1 files changed, 169 insertions, 0 deletions
diff --git a/fs/jfs/jfs_dinode.h b/fs/jfs/jfs_dinode.h new file mode 100644 index 000000000..6b231d0d0 --- /dev/null +++ b/fs/jfs/jfs_dinode.h @@ -0,0 +1,169 @@ +/* SPDX-License-Identifier: GPL-2.0-or-later */ +/* + * Copyright (C) International Business Machines Corp., 2000-2001 + */ +#ifndef _H_JFS_DINODE +#define _H_JFS_DINODE + +/* + * jfs_dinode.h: on-disk inode manager + */ + +#define INODESLOTSIZE 128 +#define L2INODESLOTSIZE 7 +#define log2INODESIZE 9 /* log2(bytes per dinode) */ + + +/* + * on-disk inode : 512 bytes + * + * note: align 64-bit fields on 8-byte boundary. + */ +struct dinode { + /* + * I. base area (128 bytes) + * ------------------------ + * + * 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 */ + + /* + * Extension Areas. + * + * 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. + */ + 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 +#define di_parent di_dtroot.header.idotdot +#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 { + /* + * The fast symlink area + * is expected to overflow + * into _inlineea when + * needed (which will clear + * INLINEEA). + */ + struct { + union { + __le32 _rdev; /* 4: */ + u8 _fastsymlink[128]; + } _u; + u8 _inlineea[128]; + }; + u8 _inline_all[256]; + }; + } _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 +#define di_inlineea u._file._u2._special._inlineea +#define di_inline_all u._file._u2._special._inline_all + } u; +}; + +/* extended mode bits (on-disk inode di_mode) */ +#define IFJOURNAL 0x00010000 /* journalled file */ +#define ISPARSE 0x00020000 /* sparse file enabled */ +#define INLINEEA 0x00040000 /* inline EA area free */ +#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 */ +#define IHIDDEN 0x04000000 /* hidden file */ +#define ISYSTEM 0x08000000 /* system file */ + +#define IDIRECTORY 0x20000000 /* directory (shadow of real bit) */ +#define IARCHIVE 0x40000000 /* file archive bit */ +#define INEWNAME 0x80000000 /* non-8.3 filename format */ + +#define IRASH 0x4E000000 /* mask for changeable attributes */ +#define ATTRSHIFT 25 /* bits to shift to move attribute + specification to mode position */ + +/* 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 + +#endif /*_H_JFS_DINODE */ |