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