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0001 /* SPDX-License-Identifier: GPL-2.0 */ 0002 #ifndef _LINUX_SYSV_FS_H 0003 #define _LINUX_SYSV_FS_H 0004 0005 #define __packed2__ __attribute__((packed, aligned(2))) 0006 0007 0008 #ifndef __KERNEL__ 0009 typedef u16 __fs16; 0010 typedef u32 __fs16; 0011 #endif 0012 0013 /* inode numbers are 16 bit */ 0014 typedef __fs16 sysv_ino_t; 0015 0016 /* Block numbers are 24 bit, sometimes stored in 32 bit. 0017 On Coherent FS, they are always stored in PDP-11 manner: the least 0018 significant 16 bits come last. */ 0019 typedef __fs32 sysv_zone_t; 0020 0021 /* 0 is non-existent */ 0022 #define SYSV_BADBL_INO 1 /* inode of bad blocks file */ 0023 #define SYSV_ROOT_INO 2 /* inode of root directory */ 0024 0025 0026 /* Xenix super-block data on disk */ 0027 #define XENIX_NICINOD 100 /* number of inode cache entries */ 0028 #define XENIX_NICFREE 100 /* number of free block list chunk entries */ 0029 struct xenix_super_block { 0030 __fs16 s_isize; /* index of first data zone */ 0031 __fs32 s_fsize __packed2__; /* total number of zones of this fs */ 0032 /* the start of the free block list: */ 0033 __fs16 s_nfree; /* number of free blocks in s_free, <= XENIX_NICFREE */ 0034 sysv_zone_t s_free[XENIX_NICFREE]; /* first free block list chunk */ 0035 /* the cache of free inodes: */ 0036 __fs16 s_ninode; /* number of free inodes in s_inode, <= XENIX_NICINOD */ 0037 sysv_ino_t s_inode[XENIX_NICINOD]; /* some free inodes */ 0038 /* locks, not used by Linux: */ 0039 char s_flock; /* lock during free block list manipulation */ 0040 char s_ilock; /* lock during inode cache manipulation */ 0041 char s_fmod; /* super-block modified flag */ 0042 char s_ronly; /* flag whether fs is mounted read-only */ 0043 __fs32 s_time __packed2__; /* time of last super block update */ 0044 __fs32 s_tfree __packed2__; /* total number of free zones */ 0045 __fs16 s_tinode; /* total number of free inodes */ 0046 __fs16 s_dinfo[4]; /* device information ?? */ 0047 char s_fname[6]; /* file system volume name */ 0048 char s_fpack[6]; /* file system pack name */ 0049 char s_clean; /* set to 0x46 when filesystem is properly unmounted */ 0050 char s_fill[371]; 0051 s32 s_magic; /* version of file system */ 0052 __fs32 s_type; /* type of file system: 1 for 512 byte blocks 0053 2 for 1024 byte blocks 0054 3 for 2048 byte blocks */ 0055 0056 }; 0057 0058 /* 0059 * SystemV FS comes in two variants: 0060 * sysv2: System V Release 2 (e.g. Microport), structure elements aligned(2). 0061 * sysv4: System V Release 4 (e.g. Consensys), structure elements aligned(4). 0062 */ 0063 #define SYSV_NICINOD 100 /* number of inode cache entries */ 0064 #define SYSV_NICFREE 50 /* number of free block list chunk entries */ 0065 0066 /* SystemV4 super-block data on disk */ 0067 struct sysv4_super_block { 0068 __fs16 s_isize; /* index of first data zone */ 0069 u16 s_pad0; 0070 __fs32 s_fsize; /* total number of zones of this fs */ 0071 /* the start of the free block list: */ 0072 __fs16 s_nfree; /* number of free blocks in s_free, <= SYSV_NICFREE */ 0073 u16 s_pad1; 0074 sysv_zone_t s_free[SYSV_NICFREE]; /* first free block list chunk */ 0075 /* the cache of free inodes: */ 0076 __fs16 s_ninode; /* number of free inodes in s_inode, <= SYSV_NICINOD */ 0077 u16 s_pad2; 0078 sysv_ino_t s_inode[SYSV_NICINOD]; /* some free inodes */ 0079 /* locks, not used by Linux: */ 0080 char s_flock; /* lock during free block list manipulation */ 0081 char s_ilock; /* lock during inode cache manipulation */ 0082 char s_fmod; /* super-block modified flag */ 0083 char s_ronly; /* flag whether fs is mounted read-only */ 0084 __fs32 s_time; /* time of last super block update */ 0085 __fs16 s_dinfo[4]; /* device information ?? */ 0086 __fs32 s_tfree; /* total number of free zones */ 0087 __fs16 s_tinode; /* total number of free inodes */ 0088 u16 s_pad3; 0089 char s_fname[6]; /* file system volume name */ 0090 char s_fpack[6]; /* file system pack name */ 0091 s32 s_fill[12]; 0092 __fs32 s_state; /* file system state: 0x7c269d38-s_time means clean */ 0093 s32 s_magic; /* version of file system */ 0094 __fs32 s_type; /* type of file system: 1 for 512 byte blocks 0095 2 for 1024 byte blocks */ 0096 }; 0097 0098 /* SystemV2 super-block data on disk */ 0099 struct sysv2_super_block { 0100 __fs16 s_isize; /* index of first data zone */ 0101 __fs32 s_fsize __packed2__; /* total number of zones of this fs */ 0102 /* the start of the free block list: */ 0103 __fs16 s_nfree; /* number of free blocks in s_free, <= SYSV_NICFREE */ 0104 sysv_zone_t s_free[SYSV_NICFREE]; /* first free block list chunk */ 0105 /* the cache of free inodes: */ 0106 __fs16 s_ninode; /* number of free inodes in s_inode, <= SYSV_NICINOD */ 0107 sysv_ino_t s_inode[SYSV_NICINOD]; /* some free inodes */ 0108 /* locks, not used by Linux: */ 0109 char s_flock; /* lock during free block list manipulation */ 0110 char s_ilock; /* lock during inode cache manipulation */ 0111 char s_fmod; /* super-block modified flag */ 0112 char s_ronly; /* flag whether fs is mounted read-only */ 0113 __fs32 s_time __packed2__; /* time of last super block update */ 0114 __fs16 s_dinfo[4]; /* device information ?? */ 0115 __fs32 s_tfree __packed2__; /* total number of free zones */ 0116 __fs16 s_tinode; /* total number of free inodes */ 0117 char s_fname[6]; /* file system volume name */ 0118 char s_fpack[6]; /* file system pack name */ 0119 s32 s_fill[14]; 0120 __fs32 s_state; /* file system state: 0xcb096f43 means clean */ 0121 s32 s_magic; /* version of file system */ 0122 __fs32 s_type; /* type of file system: 1 for 512 byte blocks 0123 2 for 1024 byte blocks */ 0124 }; 0125 0126 /* V7 super-block data on disk */ 0127 #define V7_NICINOD 100 /* number of inode cache entries */ 0128 #define V7_NICFREE 50 /* number of free block list chunk entries */ 0129 struct v7_super_block { 0130 __fs16 s_isize; /* index of first data zone */ 0131 __fs32 s_fsize __packed2__; /* total number of zones of this fs */ 0132 /* the start of the free block list: */ 0133 __fs16 s_nfree; /* number of free blocks in s_free, <= V7_NICFREE */ 0134 sysv_zone_t s_free[V7_NICFREE]; /* first free block list chunk */ 0135 /* the cache of free inodes: */ 0136 __fs16 s_ninode; /* number of free inodes in s_inode, <= V7_NICINOD */ 0137 sysv_ino_t s_inode[V7_NICINOD]; /* some free inodes */ 0138 /* locks, not used by Linux or V7: */ 0139 char s_flock; /* lock during free block list manipulation */ 0140 char s_ilock; /* lock during inode cache manipulation */ 0141 char s_fmod; /* super-block modified flag */ 0142 char s_ronly; /* flag whether fs is mounted read-only */ 0143 __fs32 s_time __packed2__; /* time of last super block update */ 0144 /* the following fields are not maintained by V7: */ 0145 __fs32 s_tfree __packed2__; /* total number of free zones */ 0146 __fs16 s_tinode; /* total number of free inodes */ 0147 __fs16 s_m; /* interleave factor */ 0148 __fs16 s_n; /* interleave factor */ 0149 char s_fname[6]; /* file system name */ 0150 char s_fpack[6]; /* file system pack name */ 0151 }; 0152 /* Constants to aid sanity checking */ 0153 /* This is not a hard limit, nor enforced by v7 kernel. It's actually just 0154 * the limit used by Seventh Edition's ls, though is high enough to assume 0155 * that no reasonable file system would have that much entries in root 0156 * directory. Thus, if we see anything higher, we just probably got the 0157 * endiannes wrong. */ 0158 #define V7_NFILES 1024 0159 /* The disk addresses are three-byte (despite direct block addresses being 0160 * aligned word-wise in inode). If the most significant byte is non-zero, 0161 * something is most likely wrong (not a filesystem, bad bytesex). */ 0162 #define V7_MAXSIZE 0x00ffffff 0163 0164 /* Coherent super-block data on disk */ 0165 #define COH_NICINOD 100 /* number of inode cache entries */ 0166 #define COH_NICFREE 64 /* number of free block list chunk entries */ 0167 struct coh_super_block { 0168 __fs16 s_isize; /* index of first data zone */ 0169 __fs32 s_fsize __packed2__; /* total number of zones of this fs */ 0170 /* the start of the free block list: */ 0171 __fs16 s_nfree; /* number of free blocks in s_free, <= COH_NICFREE */ 0172 sysv_zone_t s_free[COH_NICFREE] __packed2__; /* first free block list chunk */ 0173 /* the cache of free inodes: */ 0174 __fs16 s_ninode; /* number of free inodes in s_inode, <= COH_NICINOD */ 0175 sysv_ino_t s_inode[COH_NICINOD]; /* some free inodes */ 0176 /* locks, not used by Linux: */ 0177 char s_flock; /* lock during free block list manipulation */ 0178 char s_ilock; /* lock during inode cache manipulation */ 0179 char s_fmod; /* super-block modified flag */ 0180 char s_ronly; /* flag whether fs is mounted read-only */ 0181 __fs32 s_time __packed2__; /* time of last super block update */ 0182 __fs32 s_tfree __packed2__; /* total number of free zones */ 0183 __fs16 s_tinode; /* total number of free inodes */ 0184 __fs16 s_interleave_m; /* interleave factor */ 0185 __fs16 s_interleave_n; 0186 char s_fname[6]; /* file system volume name */ 0187 char s_fpack[6]; /* file system pack name */ 0188 __fs32 s_unique; /* zero, not used */ 0189 }; 0190 0191 /* SystemV/Coherent inode data on disk */ 0192 struct sysv_inode { 0193 __fs16 i_mode; 0194 __fs16 i_nlink; 0195 __fs16 i_uid; 0196 __fs16 i_gid; 0197 __fs32 i_size; 0198 u8 i_data[3*(10+1+1+1)]; 0199 u8 i_gen; 0200 __fs32 i_atime; /* time of last access */ 0201 __fs32 i_mtime; /* time of last modification */ 0202 __fs32 i_ctime; /* time of creation */ 0203 }; 0204 0205 /* SystemV/Coherent directory entry on disk */ 0206 #define SYSV_NAMELEN 14 /* max size of name in struct sysv_dir_entry */ 0207 struct sysv_dir_entry { 0208 sysv_ino_t inode; 0209 char name[SYSV_NAMELEN]; /* up to 14 characters, the rest are zeroes */ 0210 }; 0211 0212 #define SYSV_DIRSIZE sizeof(struct sysv_dir_entry) /* size of every directory entry */ 0213 0214 #endif /* _LINUX_SYSV_FS_H */
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