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jfs_dinode.h
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jfs_dinode.h
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/*
* Copyright (C) International Business Machines Corp., 2000-2001
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
* the GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#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 {
__le32 _rdev; /* 4: */
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
#define di_inlineea u._file._u2._special._inlineea
} 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
/* 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)
#endif /*_H_JFS_DINODE */