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      1 /*	$NetBSD: efs_dinode.h,v 1.3 2016/07/07 06:55:42 msaitoh Exp $	*/
      2 
      3 /*
      4  * Copyright (c) 2006 Stephen M. Rumble <rumble (at) ephemeral.org>
      5  *
      6  * Permission to use, copy, modify, and distribute this software for any
      7  * purpose with or without fee is hereby granted, provided that the above
      8  * copyright notice and this permission notice appear in all copies.
      9  *
     10  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
     11  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
     12  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
     13  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
     14  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
     15  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
     16  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
     17  */
     18 
     19 /*
     20  * EFS on-disk inode format.
     21  *
     22  * See IRIX inode(4)
     23  */
     24 
     25 #ifndef _FS_EFS_EFS_DINODE_H_
     26 #define _FS_EFS_EFS_DINODE_H_
     27 
     28 /*
     29  * Historical locations are always good.
     30  */
     31 #define EFS_ROOTINO	((ino_t)2)
     32 
     33 /*
     34  * EFS on-disk inode structure (128 bytes)
     35  *
     36  * [0] - NetBSD native uid_t is uint32_t.
     37  * [1] - NetBSD native gid_t is uint32_t.
     38  * [2] - NetBSD native off_t is int64_t.
     39  * [3] - See notes for di_u below for meanings of di_numextents.
     40  * [4] - Always 0 with EFS. Apparently it could take on other values when
     41  *	 used in conjunction with AFS.
     42  */
     43 
     44 #define EFS_DIRECTEXTENTS 12
     45 struct efs_dinode {
     46 	uint16_t	di_mode;	/* 0:  file type and permissions */
     47 	int16_t		di_nlink;	/* 2:  link count (minimum 2) */
     48 	uint16_t	di_uid;		/* 4:  user ID [0] */
     49 	uint16_t	di_gid;		/* 6:  group ID [1] */
     50 	int32_t		di_size;	/* 8:  file size (in bytes) [2] */
     51 	uint32_t	di_atime;	/* 12: file access time */
     52 	uint32_t	di_mtime;	/* 16: file modification time */
     53 	uint32_t	di_ctime;	/* 20: inode modification time */
     54 	int32_t		di_gen;		/* 24: inode generation number */
     55 	int16_t		di_numextents;	/* 28: number of extents in file [3] */
     56 	uint8_t		di_version;	/* 30: inode version [4] */
     57 	uint8_t		di_spare;	/* 31: unused */
     58 
     59 	union {
     60 		/*
     61 		 * If di_numextents <= EFS_DIRECTEXTENTS, _di_extents contains
     62 		 * direct extent descriptors.
     63 		 *
     64 		 * else (di_numextents > EFS_DIRECTEXTENTS), _di_extents
     65 		 * contains indirect extent descriptors.
     66 		 *
     67 		 * If indirect extents are being used, extents[0].ex_offset
     68 		 * contains the number of indirect extents, i.e. the valid
     69 		 * offsets in 'extents' are:
     70 		 *     extents[0 ... (extents[0].ex_offset - 1)]
     71 		 * It's not presently known if the ex_offset fields in
     72 		 * extents[1 ... EFS_DIRECTEXTENTS] have any meaning.
     73 		 */
     74 		struct efs_dextent extents[EFS_DIRECTEXTENTS];
     75 
     76 		/*
     77 		 * If di_numextents == 0 and di_mode indicates a symlink, the
     78 		 * symlink path is inlined into _di_symlink. Otherwise, the
     79 		 * symlink exists in extents.
     80 		 *
     81 		 * Note that the symlink is stored without nul-termination,
     82 		 * and di_size reflects this length.
     83 		 */
     84 		char symlink[sizeof(struct efs_dextent) * EFS_DIRECTEXTENTS];
     85 
     86 		/*
     87 		 * If di_numextents == 0 and di_mode indicates a character or
     88 		 * block special file, the device tag is contained in _di_dev.
     89 		 *
     90 		 * Note that IRIX moved from 16bit to 32bit dev_t's at some
     91 		 * point and a new field was added. It appears that when 32bit
     92 		 * dev_t's are used, di_odev is set to 0xffff.
     93 		 */
     94 		struct {
     95 			uint16_t dev_old;
     96 			uint32_t dev_new;
     97 		} __packed dev;
     98 	} di_u;
     99 } __packed;
    100 
    101 #define di_extents	di_u.extents
    102 #define di_symlink	di_u.symlink
    103 #define di_odev		di_u.dev.dev_old
    104 #define di_ndev		di_u.dev.dev_new
    105 
    106 #define EFS_DINODE_SIZE		sizeof(struct efs_dinode)
    107 #define EFS_DINODES_PER_BB	(EFS_BB_SIZE / EFS_DINODE_SIZE)
    108 
    109 #define EFS_DINODE_ODEV_INVALID	(0xffff)
    110 #define EFS_DINODE_ODEV_MAJ(_x)	(((_x) >>  8) & 0x7f)
    111 #define EFS_DINODE_ODEV_MIN(_x)	(((_x) >>  0) & 0xff)
    112 #define EFS_DINODE_NDEV_MAJ(_x)	(((_x) >> 18) & 0x1ff)
    113 #define EFS_DINODE_NDEV_MIN(_x)	(((_x) >>  0) & 0x3ffff)
    114 
    115 /* EFS file permissions. */
    116 #define EFS_IEXEC	0000100		/* executable */
    117 #define EFS_IWRITE	0000200		/* writable */
    118 #define EFS_IREAD	0000400		/* readable */
    119 #define EFS_ISVTX	0001000		/* sticky bit */
    120 #define EFS_ISGID	0002000		/* setgid */
    121 #define EFS_ISUID	0004000		/* setuid */
    122 
    123 /* EFS file types. */
    124 #define EFS_IFMT	0170000		/* file type mask */
    125 #define EFS_IFIFO	0010000		/* named pipe */
    126 #define EFS_IFCHR	0020000		/* character device */
    127 #define EFS_IFDIR	0040000		/* directory */
    128 #define EFS_IFBLK	0060000		/* block device */
    129 #define EFS_IFREG	0100000		/* regular file */
    130 #define EFS_IFLNK	0120000		/* symlink */
    131 #define EFS_IFSOCK	0140000		/* UNIX domain socket */
    132 
    133 #endif /* !_FS_EFS_EFS_DINODE_H_ */
    134