/*      $NetBSD: efs_dinode.h,v 1.3 2016/07/07 06:55:42 msaitoh Exp $   */

/*
* Copyright (c) 2006 Stephen M. Rumble <[email protected]>
*
* 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_ */

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