sysv_fs.h (9250B)
1/* SPDX-License-Identifier: GPL-2.0 */ 2#ifndef _LINUX_SYSV_FS_H 3#define _LINUX_SYSV_FS_H 4 5#define __packed2__ __attribute__((packed, aligned(2))) 6 7 8#ifndef __KERNEL__ 9typedef u16 __fs16; 10typedef u32 __fs16; 11#endif 12 13/* inode numbers are 16 bit */ 14typedef __fs16 sysv_ino_t; 15 16/* Block numbers are 24 bit, sometimes stored in 32 bit. 17 On Coherent FS, they are always stored in PDP-11 manner: the least 18 significant 16 bits come last. */ 19typedef __fs32 sysv_zone_t; 20 21/* 0 is non-existent */ 22#define SYSV_BADBL_INO 1 /* inode of bad blocks file */ 23#define SYSV_ROOT_INO 2 /* inode of root directory */ 24 25 26/* Xenix super-block data on disk */ 27#define XENIX_NICINOD 100 /* number of inode cache entries */ 28#define XENIX_NICFREE 100 /* number of free block list chunk entries */ 29struct xenix_super_block { 30 __fs16 s_isize; /* index of first data zone */ 31 __fs32 s_fsize __packed2__; /* total number of zones of this fs */ 32 /* the start of the free block list: */ 33 __fs16 s_nfree; /* number of free blocks in s_free, <= XENIX_NICFREE */ 34 sysv_zone_t s_free[XENIX_NICFREE]; /* first free block list chunk */ 35 /* the cache of free inodes: */ 36 __fs16 s_ninode; /* number of free inodes in s_inode, <= XENIX_NICINOD */ 37 sysv_ino_t s_inode[XENIX_NICINOD]; /* some free inodes */ 38 /* locks, not used by Linux: */ 39 char s_flock; /* lock during free block list manipulation */ 40 char s_ilock; /* lock during inode cache manipulation */ 41 char s_fmod; /* super-block modified flag */ 42 char s_ronly; /* flag whether fs is mounted read-only */ 43 __fs32 s_time __packed2__; /* time of last super block update */ 44 __fs32 s_tfree __packed2__; /* total number of free zones */ 45 __fs16 s_tinode; /* total number of free inodes */ 46 __fs16 s_dinfo[4]; /* device information ?? */ 47 char s_fname[6]; /* file system volume name */ 48 char s_fpack[6]; /* file system pack name */ 49 char s_clean; /* set to 0x46 when filesystem is properly unmounted */ 50 char s_fill[371]; 51 s32 s_magic; /* version of file system */ 52 __fs32 s_type; /* type of file system: 1 for 512 byte blocks 53 2 for 1024 byte blocks 54 3 for 2048 byte blocks */ 55 56}; 57 58/* 59 * SystemV FS comes in two variants: 60 * sysv2: System V Release 2 (e.g. Microport), structure elements aligned(2). 61 * sysv4: System V Release 4 (e.g. Consensys), structure elements aligned(4). 62 */ 63#define SYSV_NICINOD 100 /* number of inode cache entries */ 64#define SYSV_NICFREE 50 /* number of free block list chunk entries */ 65 66/* SystemV4 super-block data on disk */ 67struct sysv4_super_block { 68 __fs16 s_isize; /* index of first data zone */ 69 u16 s_pad0; 70 __fs32 s_fsize; /* total number of zones of this fs */ 71 /* the start of the free block list: */ 72 __fs16 s_nfree; /* number of free blocks in s_free, <= SYSV_NICFREE */ 73 u16 s_pad1; 74 sysv_zone_t s_free[SYSV_NICFREE]; /* first free block list chunk */ 75 /* the cache of free inodes: */ 76 __fs16 s_ninode; /* number of free inodes in s_inode, <= SYSV_NICINOD */ 77 u16 s_pad2; 78 sysv_ino_t s_inode[SYSV_NICINOD]; /* some free inodes */ 79 /* locks, not used by Linux: */ 80 char s_flock; /* lock during free block list manipulation */ 81 char s_ilock; /* lock during inode cache manipulation */ 82 char s_fmod; /* super-block modified flag */ 83 char s_ronly; /* flag whether fs is mounted read-only */ 84 __fs32 s_time; /* time of last super block update */ 85 __fs16 s_dinfo[4]; /* device information ?? */ 86 __fs32 s_tfree; /* total number of free zones */ 87 __fs16 s_tinode; /* total number of free inodes */ 88 u16 s_pad3; 89 char s_fname[6]; /* file system volume name */ 90 char s_fpack[6]; /* file system pack name */ 91 s32 s_fill[12]; 92 __fs32 s_state; /* file system state: 0x7c269d38-s_time means clean */ 93 s32 s_magic; /* version of file system */ 94 __fs32 s_type; /* type of file system: 1 for 512 byte blocks 95 2 for 1024 byte blocks */ 96}; 97 98/* SystemV2 super-block data on disk */ 99struct sysv2_super_block { 100 __fs16 s_isize; /* index of first data zone */ 101 __fs32 s_fsize __packed2__; /* total number of zones of this fs */ 102 /* the start of the free block list: */ 103 __fs16 s_nfree; /* number of free blocks in s_free, <= SYSV_NICFREE */ 104 sysv_zone_t s_free[SYSV_NICFREE]; /* first free block list chunk */ 105 /* the cache of free inodes: */ 106 __fs16 s_ninode; /* number of free inodes in s_inode, <= SYSV_NICINOD */ 107 sysv_ino_t s_inode[SYSV_NICINOD]; /* some free inodes */ 108 /* locks, not used by Linux: */ 109 char s_flock; /* lock during free block list manipulation */ 110 char s_ilock; /* lock during inode cache manipulation */ 111 char s_fmod; /* super-block modified flag */ 112 char s_ronly; /* flag whether fs is mounted read-only */ 113 __fs32 s_time __packed2__; /* time of last super block update */ 114 __fs16 s_dinfo[4]; /* device information ?? */ 115 __fs32 s_tfree __packed2__; /* total number of free zones */ 116 __fs16 s_tinode; /* total number of free inodes */ 117 char s_fname[6]; /* file system volume name */ 118 char s_fpack[6]; /* file system pack name */ 119 s32 s_fill[14]; 120 __fs32 s_state; /* file system state: 0xcb096f43 means clean */ 121 s32 s_magic; /* version of file system */ 122 __fs32 s_type; /* type of file system: 1 for 512 byte blocks 123 2 for 1024 byte blocks */ 124}; 125 126/* V7 super-block data on disk */ 127#define V7_NICINOD 100 /* number of inode cache entries */ 128#define V7_NICFREE 50 /* number of free block list chunk entries */ 129struct v7_super_block { 130 __fs16 s_isize; /* index of first data zone */ 131 __fs32 s_fsize __packed2__; /* total number of zones of this fs */ 132 /* the start of the free block list: */ 133 __fs16 s_nfree; /* number of free blocks in s_free, <= V7_NICFREE */ 134 sysv_zone_t s_free[V7_NICFREE]; /* first free block list chunk */ 135 /* the cache of free inodes: */ 136 __fs16 s_ninode; /* number of free inodes in s_inode, <= V7_NICINOD */ 137 sysv_ino_t s_inode[V7_NICINOD]; /* some free inodes */ 138 /* locks, not used by Linux or V7: */ 139 char s_flock; /* lock during free block list manipulation */ 140 char s_ilock; /* lock during inode cache manipulation */ 141 char s_fmod; /* super-block modified flag */ 142 char s_ronly; /* flag whether fs is mounted read-only */ 143 __fs32 s_time __packed2__; /* time of last super block update */ 144 /* the following fields are not maintained by V7: */ 145 __fs32 s_tfree __packed2__; /* total number of free zones */ 146 __fs16 s_tinode; /* total number of free inodes */ 147 __fs16 s_m; /* interleave factor */ 148 __fs16 s_n; /* interleave factor */ 149 char s_fname[6]; /* file system name */ 150 char s_fpack[6]; /* file system pack name */ 151}; 152/* Constants to aid sanity checking */ 153/* This is not a hard limit, nor enforced by v7 kernel. It's actually just 154 * the limit used by Seventh Edition's ls, though is high enough to assume 155 * that no reasonable file system would have that much entries in root 156 * directory. Thus, if we see anything higher, we just probably got the 157 * endiannes wrong. */ 158#define V7_NFILES 1024 159/* The disk addresses are three-byte (despite direct block addresses being 160 * aligned word-wise in inode). If the most significant byte is non-zero, 161 * something is most likely wrong (not a filesystem, bad bytesex). */ 162#define V7_MAXSIZE 0x00ffffff 163 164/* Coherent super-block data on disk */ 165#define COH_NICINOD 100 /* number of inode cache entries */ 166#define COH_NICFREE 64 /* number of free block list chunk entries */ 167struct coh_super_block { 168 __fs16 s_isize; /* index of first data zone */ 169 __fs32 s_fsize __packed2__; /* total number of zones of this fs */ 170 /* the start of the free block list: */ 171 __fs16 s_nfree; /* number of free blocks in s_free, <= COH_NICFREE */ 172 sysv_zone_t s_free[COH_NICFREE] __packed2__; /* first free block list chunk */ 173 /* the cache of free inodes: */ 174 __fs16 s_ninode; /* number of free inodes in s_inode, <= COH_NICINOD */ 175 sysv_ino_t s_inode[COH_NICINOD]; /* some free inodes */ 176 /* locks, not used by Linux: */ 177 char s_flock; /* lock during free block list manipulation */ 178 char s_ilock; /* lock during inode cache manipulation */ 179 char s_fmod; /* super-block modified flag */ 180 char s_ronly; /* flag whether fs is mounted read-only */ 181 __fs32 s_time __packed2__; /* time of last super block update */ 182 __fs32 s_tfree __packed2__; /* total number of free zones */ 183 __fs16 s_tinode; /* total number of free inodes */ 184 __fs16 s_interleave_m; /* interleave factor */ 185 __fs16 s_interleave_n; 186 char s_fname[6]; /* file system volume name */ 187 char s_fpack[6]; /* file system pack name */ 188 __fs32 s_unique; /* zero, not used */ 189}; 190 191/* SystemV/Coherent inode data on disk */ 192struct sysv_inode { 193 __fs16 i_mode; 194 __fs16 i_nlink; 195 __fs16 i_uid; 196 __fs16 i_gid; 197 __fs32 i_size; 198 u8 i_data[3*(10+1+1+1)]; 199 u8 i_gen; 200 __fs32 i_atime; /* time of last access */ 201 __fs32 i_mtime; /* time of last modification */ 202 __fs32 i_ctime; /* time of creation */ 203}; 204 205/* SystemV/Coherent directory entry on disk */ 206#define SYSV_NAMELEN 14 /* max size of name in struct sysv_dir_entry */ 207struct sysv_dir_entry { 208 sysv_ino_t inode; 209 char name[SYSV_NAMELEN]; /* up to 14 characters, the rest are zeroes */ 210}; 211 212#define SYSV_DIRSIZE sizeof(struct sysv_dir_entry) /* size of every directory entry */ 213 214#endif /* _LINUX_SYSV_FS_H */