NetBSD/sys/fs/efs/efs_dinode.h

134 lines
4.5 KiB
C

/* $NetBSD: efs_dinode.h,v 1.2 2007/06/30 15:56:16 rumble Exp $ */
/*
* Copyright (c) 2006 Stephen M. Rumble <rumble@ephemeral.org>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
/*
* EFS on-disk inode format.
*
* See IRIX inode(4)
*/
#ifndef _FS_EFS_EFS_DINODE_H_
#define _FS_EFS_EFS_DINODE_H_
/*
* Historical locations are always good.
*/
#define EFS_ROOTINO ((ino_t)2)
/*
* EFS on-disk inode structure (128 bytes)
*
* [0] - NetBSD native uid_t is uint32_t.
* [1] - NetBSD native gid_t is uint32_t.
* [2] - NetBSD native off_t is int64_t.
* [3] - See notes for di_u below for meanings of di_numextents.
* [4] - Always 0 with EFS. Apparently it could take on other values when
* used in conjunction with AFS.
*/
#define EFS_DIRECTEXTENTS 12
struct efs_dinode {
uint16_t di_mode; /* 0: file type and permissions */
int16_t di_nlink; /* 2: link count (minimum 2) */
uint16_t di_uid; /* 4: user ID [0] */
uint16_t di_gid; /* 6: group ID [1] */
int32_t di_size; /* 8: file size (in bytes) [2] */
uint32_t di_atime; /* 12: file access time */
uint32_t di_mtime; /* 16: file modification time */
uint32_t di_ctime; /* 20: inode modification time */
int32_t di_gen; /* 24: inode generation number */
int16_t di_numextents; /* 28: number of extents in file [3] */
uint8_t di_version; /* 30: inode version [4] */
uint8_t di_spare; /* 31: unused */
union {
/*
* If di_numextents <= EFS_DIRECTEXTENTS, _di_extents contains
* direct extent descriptors.
*
* else (di_numextents > EFS_DIRECTEXTENTS), _di_extents
* contains indirect extent descriptors.
*
* If indirect extents are being used, extents[0].ex_offset
* contains the number of indirect extents, i.e. the valid
* offsets in 'extents' are:
* extents[0 ... (extents[0].ex_offset - 1)]
* It's not presently known if the ex_offset fields in
* extents[1 ... EFS_DIRECTEXTENTS] have any meaning.
*/
struct efs_dextent extents[EFS_DIRECTEXTENTS];
/*
* If di_numextents == 0 and di_mode indicates a symlink, the
* symlink path is inlined into _di_symlink. Otherwise, the
* symlink exists in extents.
*
* Note that the symlink is stored without nul-termination,
* and di_size reflects this length.
*/
char symlink[sizeof(struct efs_dextent) * EFS_DIRECTEXTENTS];
/*
* If di_numextents == 0 and di_mode indicates a character or
* block special file, the device tag is contained in _di_dev.
*
* Note that IRIX moved from 16bit to 32bit dev_t's at some
* point and a new field was added. It appears that when 32bit
* dev_t's are used, di_odev is set to 0xffff.
*/
struct {
uint16_t dev_old;
uint32_t dev_new;
} __packed dev;
} di_u;
} __packed;
#define di_extents di_u.extents
#define di_symlink di_u.symlink
#define di_odev di_u.dev.dev_old
#define di_ndev di_u.dev.dev_new
#define EFS_DINODE_SIZE sizeof(struct efs_dinode)
#define EFS_DINODES_PER_BB (EFS_BB_SIZE / EFS_DINODE_SIZE)
#define EFS_DINODE_ODEV_INVALID (0xffff)
#define EFS_DINODE_ODEV_MAJ(_x) (((_x) >> 8) & 0x7f)
#define EFS_DINODE_ODEV_MIN(_x) (((_x) >> 0) & 0xff)
#define EFS_DINODE_NDEV_MAJ(_x) (((_x) >> 18) & 0x1ff)
#define EFS_DINODE_NDEV_MIN(_x) (((_x) >> 0) & 0x3ffff)
/* EFS file permissions. */
#define EFS_IEXEC 0000100 /* executable */
#define EFS_IWRITE 0000200 /* writable */
#define EFS_IREAD 0000400 /* readable */
#define EFS_ISVTX 0001000 /* sticky bit */
#define EFS_ISGID 0002000 /* setgid */
#define EFS_ISUID 0004000 /* setuid */
/* EFS file types. */
#define EFS_IFMT 0170000 /* file type mask */
#define EFS_IFIFO 0010000 /* named pipe */
#define EFS_IFCHR 0020000 /* character device */
#define EFS_IFDIR 0040000 /* directory */
#define EFS_IFBLK 0060000 /* block device */
#define EFS_IFREG 0100000 /* regular file */
#define EFS_IFLNK 0120000 /* symlink */
#define EFS_IFSOCK 0140000 /* UNIX domain socket */
#endif /* !_FS_EFS_EFS_DINODE_H_ */