diff options
Diffstat (limited to 'kernel/include/linux/sysv_fs.h')
| -rw-r--r-- | kernel/include/linux/sysv_fs.h | 213 |
1 files changed, 213 insertions, 0 deletions
diff --git a/kernel/include/linux/sysv_fs.h b/kernel/include/linux/sysv_fs.h new file mode 100644 index 000000000..e47d6d900 --- /dev/null +++ b/kernel/include/linux/sysv_fs.h @@ -0,0 +1,213 @@ +#ifndef _LINUX_SYSV_FS_H +#define _LINUX_SYSV_FS_H + +#define __packed2__ __attribute__((packed, aligned(2))) + + +#ifndef __KERNEL__ +typedef u16 __fs16; +typedef u32 __fs16; +#endif + +/* inode numbers are 16 bit */ +typedef __fs16 sysv_ino_t; + +/* Block numbers are 24 bit, sometimes stored in 32 bit. + On Coherent FS, they are always stored in PDP-11 manner: the least + significant 16 bits come last. */ +typedef __fs32 sysv_zone_t; + +/* 0 is non-existent */ +#define SYSV_BADBL_INO 1 /* inode of bad blocks file */ +#define SYSV_ROOT_INO 2 /* inode of root directory */ + + +/* Xenix super-block data on disk */ +#define XENIX_NICINOD 100 /* number of inode cache entries */ +#define XENIX_NICFREE 100 /* number of free block list chunk entries */ +struct xenix_super_block { + __fs16 s_isize; /* index of first data zone */ + __fs32 s_fsize __packed2__; /* total number of zones of this fs */ + /* the start of the free block list: */ + __fs16 s_nfree; /* number of free blocks in s_free, <= XENIX_NICFREE */ + sysv_zone_t s_free[XENIX_NICFREE]; /* first free block list chunk */ + /* the cache of free inodes: */ + __fs16 s_ninode; /* number of free inodes in s_inode, <= XENIX_NICINOD */ + sysv_ino_t s_inode[XENIX_NICINOD]; /* some free inodes */ + /* locks, not used by Linux: */ + char s_flock; /* lock during free block list manipulation */ + char s_ilock; /* lock during inode cache manipulation */ + char s_fmod; /* super-block modified flag */ + char s_ronly; /* flag whether fs is mounted read-only */ + __fs32 s_time __packed2__; /* time of last super block update */ + __fs32 s_tfree __packed2__; /* total number of free zones */ + __fs16 s_tinode; /* total number of free inodes */ + __fs16 s_dinfo[4]; /* device information ?? */ + char s_fname[6]; /* file system volume name */ + char s_fpack[6]; /* file system pack name */ + char s_clean; /* set to 0x46 when filesystem is properly unmounted */ + char s_fill[371]; + s32 s_magic; /* version of file system */ + __fs32 s_type; /* type of file system: 1 for 512 byte blocks + 2 for 1024 byte blocks + 3 for 2048 byte blocks */ + +}; + +/* + * SystemV FS comes in two variants: + * sysv2: System V Release 2 (e.g. Microport), structure elements aligned(2). + * sysv4: System V Release 4 (e.g. Consensys), structure elements aligned(4). + */ +#define SYSV_NICINOD 100 /* number of inode cache entries */ +#define SYSV_NICFREE 50 /* number of free block list chunk entries */ + +/* SystemV4 super-block data on disk */ +struct sysv4_super_block { + __fs16 s_isize; /* index of first data zone */ + u16 s_pad0; + __fs32 s_fsize; /* total number of zones of this fs */ + /* the start of the free block list: */ + __fs16 s_nfree; /* number of free blocks in s_free, <= SYSV_NICFREE */ + u16 s_pad1; + sysv_zone_t s_free[SYSV_NICFREE]; /* first free block list chunk */ + /* the cache of free inodes: */ + __fs16 s_ninode; /* number of free inodes in s_inode, <= SYSV_NICINOD */ + u16 s_pad2; + sysv_ino_t s_inode[SYSV_NICINOD]; /* some free inodes */ + /* locks, not used by Linux: */ + char s_flock; /* lock during free block list manipulation */ + char s_ilock; /* lock during inode cache manipulation */ + char s_fmod; /* super-block modified flag */ + char s_ronly; /* flag whether fs is mounted read-only */ + __fs32 s_time; /* time of last super block update */ + __fs16 s_dinfo[4]; /* device information ?? */ + __fs32 s_tfree; /* total number of free zones */ + __fs16 s_tinode; /* total number of free inodes */ + u16 s_pad3; + char s_fname[6]; /* file system volume name */ + char s_fpack[6]; /* file system pack name */ + s32 s_fill[12]; + __fs32 s_state; /* file system state: 0x7c269d38-s_time means clean */ + s32 s_magic; /* version of file system */ + __fs32 s_type; /* type of file system: 1 for 512 byte blocks + 2 for 1024 byte blocks */ +}; + +/* SystemV2 super-block data on disk */ +struct sysv2_super_block { + __fs16 s_isize; /* index of first data zone */ + __fs32 s_fsize __packed2__; /* total number of zones of this fs */ + /* the start of the free block list: */ + __fs16 s_nfree; /* number of free blocks in s_free, <= SYSV_NICFREE */ + sysv_zone_t s_free[SYSV_NICFREE]; /* first free block list chunk */ + /* the cache of free inodes: */ + __fs16 s_ninode; /* number of free inodes in s_inode, <= SYSV_NICINOD */ + sysv_ino_t s_inode[SYSV_NICINOD]; /* some free inodes */ + /* locks, not used by Linux: */ + char s_flock; /* lock during free block list manipulation */ + char s_ilock; /* lock during inode cache manipulation */ + char s_fmod; /* super-block modified flag */ + char s_ronly; /* flag whether fs is mounted read-only */ + __fs32 s_time __packed2__; /* time of last super block update */ + __fs16 s_dinfo[4]; /* device information ?? */ + __fs32 s_tfree __packed2__; /* total number of free zones */ + __fs16 s_tinode; /* total number of free inodes */ + char s_fname[6]; /* file system volume name */ + char s_fpack[6]; /* file system pack name */ + s32 s_fill[14]; + __fs32 s_state; /* file system state: 0xcb096f43 means clean */ + s32 s_magic; /* version of file system */ + __fs32 s_type; /* type of file system: 1 for 512 byte blocks + 2 for 1024 byte blocks */ +}; + +/* V7 super-block data on disk */ +#define V7_NICINOD 100 /* number of inode cache entries */ +#define V7_NICFREE 50 /* number of free block list chunk entries */ +struct v7_super_block { + __fs16 s_isize; /* index of first data zone */ + __fs32 s_fsize __packed2__; /* total number of zones of this fs */ + /* the start of the free block list: */ + __fs16 s_nfree; /* number of free blocks in s_free, <= V7_NICFREE */ + sysv_zone_t s_free[V7_NICFREE]; /* first free block list chunk */ + /* the cache of free inodes: */ + __fs16 s_ninode; /* number of free inodes in s_inode, <= V7_NICINOD */ + sysv_ino_t s_inode[V7_NICINOD]; /* some free inodes */ + /* locks, not used by Linux or V7: */ + char s_flock; /* lock during free block list manipulation */ + char s_ilock; /* lock during inode cache manipulation */ + char s_fmod; /* super-block modified flag */ + char s_ronly; /* flag whether fs is mounted read-only */ + __fs32 s_time __packed2__; /* time of last super block update */ + /* the following fields are not maintained by V7: */ + __fs32 s_tfree __packed2__; /* total number of free zones */ + __fs16 s_tinode; /* total number of free inodes */ + __fs16 s_m; /* interleave factor */ + __fs16 s_n; /* interleave factor */ + char s_fname[6]; /* file system name */ + char s_fpack[6]; /* file system pack name */ +}; +/* Constants to aid sanity checking */ +/* This is not a hard limit, nor enforced by v7 kernel. It's actually just + * the limit used by Seventh Edition's ls, though is high enough to assume + * that no reasonable file system would have that much entries in root + * directory. Thus, if we see anything higher, we just probably got the + * endiannes wrong. */ +#define V7_NFILES 1024 +/* The disk addresses are three-byte (despite direct block addresses being + * aligned word-wise in inode). If the most significant byte is non-zero, + * something is most likely wrong (not a filesystem, bad bytesex). */ +#define V7_MAXSIZE 0x00ffffff + +/* Coherent super-block data on disk */ +#define COH_NICINOD 100 /* number of inode cache entries */ +#define COH_NICFREE 64 /* number of free block list chunk entries */ +struct coh_super_block { + __fs16 s_isize; /* index of first data zone */ + __fs32 s_fsize __packed2__; /* total number of zones of this fs */ + /* the start of the free block list: */ + __fs16 s_nfree; /* number of free blocks in s_free, <= COH_NICFREE */ + sysv_zone_t s_free[COH_NICFREE] __packed2__; /* first free block list chunk */ + /* the cache of free inodes: */ + __fs16 s_ninode; /* number of free inodes in s_inode, <= COH_NICINOD */ + sysv_ino_t s_inode[COH_NICINOD]; /* some free inodes */ + /* locks, not used by Linux: */ + char s_flock; /* lock during free block list manipulation */ + char s_ilock; /* lock during inode cache manipulation */ + char s_fmod; /* super-block modified flag */ + char s_ronly; /* flag whether fs is mounted read-only */ + __fs32 s_time __packed2__; /* time of last super block update */ + __fs32 s_tfree __packed2__; /* total number of free zones */ + __fs16 s_tinode; /* total number of free inodes */ + __fs16 s_interleave_m; /* interleave factor */ + __fs16 s_interleave_n; + char s_fname[6]; /* file system volume name */ + char s_fpack[6]; /* file system pack name */ + __fs32 s_unique; /* zero, not used */ +}; + +/* SystemV/Coherent inode data on disk */ +struct sysv_inode { + __fs16 i_mode; + __fs16 i_nlink; + __fs16 i_uid; + __fs16 i_gid; + __fs32 i_size; + u8 i_data[3*(10+1+1+1)]; + u8 i_gen; + __fs32 i_atime; /* time of last access */ + __fs32 i_mtime; /* time of last modification */ + __fs32 i_ctime; /* time of creation */ +}; + +/* SystemV/Coherent directory entry on disk */ +#define SYSV_NAMELEN 14 /* max size of name in struct sysv_dir_entry */ +struct sysv_dir_entry { + sysv_ino_t inode; + char name[SYSV_NAMELEN]; /* up to 14 characters, the rest are zeroes */ +}; + +#define SYSV_DIRSIZE sizeof(struct sysv_dir_entry) /* size of every directory entry */ + +#endif /* _LINUX_SYSV_FS_H */ |