Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | #ifndef _LINUX_SYSV_FS_H |
| 2 | #define _LINUX_SYSV_FS_H |
| 3 | |
Robert P. J. Day | dddfbaf | 2008-04-29 01:03:26 -0700 | [diff] [blame] | 4 | #define __packed2__ __attribute__((packed, aligned(2))) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5 | |
| 6 | |
| 7 | #ifndef __KERNEL__ |
| 8 | typedef u16 __fs16; |
| 9 | typedef u32 __fs16; |
| 10 | #endif |
| 11 | |
| 12 | /* inode numbers are 16 bit */ |
| 13 | typedef __fs16 sysv_ino_t; |
| 14 | |
| 15 | /* Block numbers are 24 bit, sometimes stored in 32 bit. |
| 16 | On Coherent FS, they are always stored in PDP-11 manner: the least |
| 17 | significant 16 bits come last. */ |
| 18 | typedef __fs32 sysv_zone_t; |
| 19 | |
| 20 | /* 0 is non-existent */ |
| 21 | #define SYSV_BADBL_INO 1 /* inode of bad blocks file */ |
| 22 | #define SYSV_ROOT_INO 2 /* inode of root directory */ |
| 23 | |
| 24 | |
| 25 | /* Xenix super-block data on disk */ |
| 26 | #define XENIX_NICINOD 100 /* number of inode cache entries */ |
| 27 | #define XENIX_NICFREE 100 /* number of free block list chunk entries */ |
| 28 | struct xenix_super_block { |
| 29 | __fs16 s_isize; /* index of first data zone */ |
| 30 | __fs32 s_fsize __packed2__; /* total number of zones of this fs */ |
| 31 | /* the start of the free block list: */ |
| 32 | __fs16 s_nfree; /* number of free blocks in s_free, <= XENIX_NICFREE */ |
| 33 | sysv_zone_t s_free[XENIX_NICFREE]; /* first free block list chunk */ |
| 34 | /* the cache of free inodes: */ |
| 35 | __fs16 s_ninode; /* number of free inodes in s_inode, <= XENIX_NICINOD */ |
| 36 | sysv_ino_t s_inode[XENIX_NICINOD]; /* some free inodes */ |
| 37 | /* locks, not used by Linux: */ |
| 38 | char s_flock; /* lock during free block list manipulation */ |
| 39 | char s_ilock; /* lock during inode cache manipulation */ |
| 40 | char s_fmod; /* super-block modified flag */ |
| 41 | char s_ronly; /* flag whether fs is mounted read-only */ |
| 42 | __fs32 s_time __packed2__; /* time of last super block update */ |
| 43 | __fs32 s_tfree __packed2__; /* total number of free zones */ |
| 44 | __fs16 s_tinode; /* total number of free inodes */ |
| 45 | __fs16 s_dinfo[4]; /* device information ?? */ |
| 46 | char s_fname[6]; /* file system volume name */ |
| 47 | char s_fpack[6]; /* file system pack name */ |
| 48 | char s_clean; /* set to 0x46 when filesystem is properly unmounted */ |
| 49 | char s_fill[371]; |
| 50 | s32 s_magic; /* version of file system */ |
| 51 | __fs32 s_type; /* type of file system: 1 for 512 byte blocks |
| 52 | 2 for 1024 byte blocks |
| 53 | 3 for 2048 byte blocks */ |
| 54 | |
| 55 | }; |
| 56 | |
| 57 | /* |
| 58 | * SystemV FS comes in two variants: |
| 59 | * sysv2: System V Release 2 (e.g. Microport), structure elements aligned(2). |
| 60 | * sysv4: System V Release 4 (e.g. Consensys), structure elements aligned(4). |
| 61 | */ |
| 62 | #define SYSV_NICINOD 100 /* number of inode cache entries */ |
| 63 | #define SYSV_NICFREE 50 /* number of free block list chunk entries */ |
| 64 | |
| 65 | /* SystemV4 super-block data on disk */ |
| 66 | struct sysv4_super_block { |
| 67 | __fs16 s_isize; /* index of first data zone */ |
| 68 | u16 s_pad0; |
| 69 | __fs32 s_fsize; /* total number of zones of this fs */ |
| 70 | /* the start of the free block list: */ |
| 71 | __fs16 s_nfree; /* number of free blocks in s_free, <= SYSV_NICFREE */ |
| 72 | u16 s_pad1; |
| 73 | sysv_zone_t s_free[SYSV_NICFREE]; /* first free block list chunk */ |
| 74 | /* the cache of free inodes: */ |
| 75 | __fs16 s_ninode; /* number of free inodes in s_inode, <= SYSV_NICINOD */ |
| 76 | u16 s_pad2; |
| 77 | sysv_ino_t s_inode[SYSV_NICINOD]; /* some free inodes */ |
| 78 | /* locks, not used by Linux: */ |
| 79 | char s_flock; /* lock during free block list manipulation */ |
| 80 | char s_ilock; /* lock during inode cache manipulation */ |
| 81 | char s_fmod; /* super-block modified flag */ |
| 82 | char s_ronly; /* flag whether fs is mounted read-only */ |
| 83 | __fs32 s_time; /* time of last super block update */ |
| 84 | __fs16 s_dinfo[4]; /* device information ?? */ |
| 85 | __fs32 s_tfree; /* total number of free zones */ |
| 86 | __fs16 s_tinode; /* total number of free inodes */ |
| 87 | u16 s_pad3; |
| 88 | char s_fname[6]; /* file system volume name */ |
| 89 | char s_fpack[6]; /* file system pack name */ |
| 90 | s32 s_fill[12]; |
| 91 | __fs32 s_state; /* file system state: 0x7c269d38-s_time means clean */ |
| 92 | s32 s_magic; /* version of file system */ |
| 93 | __fs32 s_type; /* type of file system: 1 for 512 byte blocks |
| 94 | 2 for 1024 byte blocks */ |
| 95 | }; |
| 96 | |
| 97 | /* SystemV2 super-block data on disk */ |
| 98 | struct sysv2_super_block { |
| 99 | __fs16 s_isize; /* index of first data zone */ |
| 100 | __fs32 s_fsize __packed2__; /* total number of zones of this fs */ |
| 101 | /* the start of the free block list: */ |
| 102 | __fs16 s_nfree; /* number of free blocks in s_free, <= SYSV_NICFREE */ |
| 103 | sysv_zone_t s_free[SYSV_NICFREE]; /* first free block list chunk */ |
| 104 | /* the cache of free inodes: */ |
| 105 | __fs16 s_ninode; /* number of free inodes in s_inode, <= SYSV_NICINOD */ |
| 106 | sysv_ino_t s_inode[SYSV_NICINOD]; /* some free inodes */ |
| 107 | /* locks, not used by Linux: */ |
| 108 | char s_flock; /* lock during free block list manipulation */ |
| 109 | char s_ilock; /* lock during inode cache manipulation */ |
| 110 | char s_fmod; /* super-block modified flag */ |
| 111 | char s_ronly; /* flag whether fs is mounted read-only */ |
| 112 | __fs32 s_time __packed2__; /* time of last super block update */ |
| 113 | __fs16 s_dinfo[4]; /* device information ?? */ |
| 114 | __fs32 s_tfree __packed2__; /* total number of free zones */ |
| 115 | __fs16 s_tinode; /* total number of free inodes */ |
| 116 | char s_fname[6]; /* file system volume name */ |
| 117 | char s_fpack[6]; /* file system pack name */ |
| 118 | s32 s_fill[14]; |
| 119 | __fs32 s_state; /* file system state: 0xcb096f43 means clean */ |
| 120 | s32 s_magic; /* version of file system */ |
| 121 | __fs32 s_type; /* type of file system: 1 for 512 byte blocks |
| 122 | 2 for 1024 byte blocks */ |
| 123 | }; |
| 124 | |
| 125 | /* V7 super-block data on disk */ |
| 126 | #define V7_NICINOD 100 /* number of inode cache entries */ |
| 127 | #define V7_NICFREE 50 /* number of free block list chunk entries */ |
| 128 | struct v7_super_block { |
| 129 | __fs16 s_isize; /* index of first data zone */ |
| 130 | __fs32 s_fsize __packed2__; /* total number of zones of this fs */ |
| 131 | /* the start of the free block list: */ |
| 132 | __fs16 s_nfree; /* number of free blocks in s_free, <= V7_NICFREE */ |
| 133 | sysv_zone_t s_free[V7_NICFREE]; /* first free block list chunk */ |
| 134 | /* the cache of free inodes: */ |
| 135 | __fs16 s_ninode; /* number of free inodes in s_inode, <= V7_NICINOD */ |
| 136 | sysv_ino_t s_inode[V7_NICINOD]; /* some free inodes */ |
| 137 | /* locks, not used by Linux or V7: */ |
| 138 | char s_flock; /* lock during free block list manipulation */ |
| 139 | char s_ilock; /* lock during inode cache manipulation */ |
| 140 | char s_fmod; /* super-block modified flag */ |
| 141 | char s_ronly; /* flag whether fs is mounted read-only */ |
| 142 | __fs32 s_time __packed2__; /* time of last super block update */ |
| 143 | /* the following fields are not maintained by V7: */ |
| 144 | __fs32 s_tfree __packed2__; /* total number of free zones */ |
| 145 | __fs16 s_tinode; /* total number of free inodes */ |
| 146 | __fs16 s_m; /* interleave factor */ |
| 147 | __fs16 s_n; /* interleave factor */ |
| 148 | char s_fname[6]; /* file system name */ |
| 149 | char s_fpack[6]; /* file system pack name */ |
| 150 | }; |
Lubomir Rintel | 0bcaa65 | 2010-08-10 18:03:33 -0700 | [diff] [blame^] | 151 | /* Constants to aid sanity checking */ |
| 152 | /* This is not a hard limit, nor enforced by v7 kernel. It's actually just |
| 153 | * the limit used by Seventh Edition's ls, though is high enough to assume |
| 154 | * that no reasonable file system would have that much entries in root |
| 155 | * directory. Thus, if we see anything higher, we just probably got the |
| 156 | * endiannes wrong. */ |
| 157 | #define V7_NFILES 1024 |
| 158 | /* The disk addresses are three-byte (despite direct block addresses being |
| 159 | * aligned word-wise in inode). If the most significant byte is non-zero, |
| 160 | * something is most likely wrong (not a filesystem, bad bytesex). */ |
| 161 | #define V7_MAXSIZE 0x00ffffff |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 162 | |
| 163 | /* Coherent super-block data on disk */ |
| 164 | #define COH_NICINOD 100 /* number of inode cache entries */ |
| 165 | #define COH_NICFREE 64 /* number of free block list chunk entries */ |
| 166 | struct coh_super_block { |
| 167 | __fs16 s_isize; /* index of first data zone */ |
| 168 | __fs32 s_fsize __packed2__; /* total number of zones of this fs */ |
| 169 | /* the start of the free block list: */ |
| 170 | __fs16 s_nfree; /* number of free blocks in s_free, <= COH_NICFREE */ |
| 171 | sysv_zone_t s_free[COH_NICFREE] __packed2__; /* first free block list chunk */ |
| 172 | /* the cache of free inodes: */ |
| 173 | __fs16 s_ninode; /* number of free inodes in s_inode, <= COH_NICINOD */ |
| 174 | sysv_ino_t s_inode[COH_NICINOD]; /* some free inodes */ |
| 175 | /* locks, not used by Linux: */ |
| 176 | char s_flock; /* lock during free block list manipulation */ |
| 177 | char s_ilock; /* lock during inode cache manipulation */ |
| 178 | char s_fmod; /* super-block modified flag */ |
| 179 | char s_ronly; /* flag whether fs is mounted read-only */ |
| 180 | __fs32 s_time __packed2__; /* time of last super block update */ |
| 181 | __fs32 s_tfree __packed2__; /* total number of free zones */ |
| 182 | __fs16 s_tinode; /* total number of free inodes */ |
| 183 | __fs16 s_interleave_m; /* interleave factor */ |
| 184 | __fs16 s_interleave_n; |
| 185 | char s_fname[6]; /* file system volume name */ |
| 186 | char s_fpack[6]; /* file system pack name */ |
| 187 | __fs32 s_unique; /* zero, not used */ |
| 188 | }; |
| 189 | |
| 190 | /* SystemV/Coherent inode data on disk */ |
| 191 | struct sysv_inode { |
| 192 | __fs16 i_mode; |
| 193 | __fs16 i_nlink; |
| 194 | __fs16 i_uid; |
| 195 | __fs16 i_gid; |
| 196 | __fs32 i_size; |
| 197 | u8 i_data[3*(10+1+1+1)]; |
| 198 | u8 i_gen; |
| 199 | __fs32 i_atime; /* time of last access */ |
| 200 | __fs32 i_mtime; /* time of last modification */ |
| 201 | __fs32 i_ctime; /* time of creation */ |
| 202 | }; |
| 203 | |
| 204 | /* SystemV/Coherent directory entry on disk */ |
| 205 | #define SYSV_NAMELEN 14 /* max size of name in struct sysv_dir_entry */ |
| 206 | struct sysv_dir_entry { |
| 207 | sysv_ino_t inode; |
| 208 | char name[SYSV_NAMELEN]; /* up to 14 characters, the rest are zeroes */ |
| 209 | }; |
| 210 | |
| 211 | #define SYSV_DIRSIZE sizeof(struct sysv_dir_entry) /* size of every directory entry */ |
| 212 | |
| 213 | #endif /* _LINUX_SYSV_FS_H */ |