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214 lines
9.0 KiB
214 lines
9.0 KiB
/* SPDX-License-Identifier: GPL-2.0 */ |
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#ifndef _LINUX_SYSV_FS_H |
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#define _LINUX_SYSV_FS_H |
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#define __packed2__ __attribute__((packed, aligned(2))) |
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#ifndef __KERNEL__ |
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typedef u16 __fs16; |
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typedef u32 __fs16; |
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#endif |
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/* inode numbers are 16 bit */ |
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typedef __fs16 sysv_ino_t; |
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/* Block numbers are 24 bit, sometimes stored in 32 bit. |
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On Coherent FS, they are always stored in PDP-11 manner: the least |
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significant 16 bits come last. */ |
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typedef __fs32 sysv_zone_t; |
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/* 0 is non-existent */ |
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#define SYSV_BADBL_INO 1 /* inode of bad blocks file */ |
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#define SYSV_ROOT_INO 2 /* inode of root directory */ |
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/* Xenix super-block data on disk */ |
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#define XENIX_NICINOD 100 /* number of inode cache entries */ |
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#define XENIX_NICFREE 100 /* number of free block list chunk entries */ |
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struct xenix_super_block { |
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__fs16 s_isize; /* index of first data zone */ |
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__fs32 s_fsize __packed2__; /* total number of zones of this fs */ |
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/* the start of the free block list: */ |
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__fs16 s_nfree; /* number of free blocks in s_free, <= XENIX_NICFREE */ |
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sysv_zone_t s_free[XENIX_NICFREE]; /* first free block list chunk */ |
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/* the cache of free inodes: */ |
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__fs16 s_ninode; /* number of free inodes in s_inode, <= XENIX_NICINOD */ |
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sysv_ino_t s_inode[XENIX_NICINOD]; /* some free inodes */ |
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/* locks, not used by Linux: */ |
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char s_flock; /* lock during free block list manipulation */ |
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char s_ilock; /* lock during inode cache manipulation */ |
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char s_fmod; /* super-block modified flag */ |
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char s_ronly; /* flag whether fs is mounted read-only */ |
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__fs32 s_time __packed2__; /* time of last super block update */ |
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__fs32 s_tfree __packed2__; /* total number of free zones */ |
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__fs16 s_tinode; /* total number of free inodes */ |
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__fs16 s_dinfo[4]; /* device information ?? */ |
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char s_fname[6]; /* file system volume name */ |
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char s_fpack[6]; /* file system pack name */ |
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char s_clean; /* set to 0x46 when filesystem is properly unmounted */ |
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char s_fill[371]; |
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s32 s_magic; /* version of file system */ |
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__fs32 s_type; /* type of file system: 1 for 512 byte blocks |
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2 for 1024 byte blocks |
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3 for 2048 byte blocks */ |
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}; |
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/* |
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* SystemV FS comes in two variants: |
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* sysv2: System V Release 2 (e.g. Microport), structure elements aligned(2). |
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* sysv4: System V Release 4 (e.g. Consensys), structure elements aligned(4). |
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*/ |
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#define SYSV_NICINOD 100 /* number of inode cache entries */ |
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#define SYSV_NICFREE 50 /* number of free block list chunk entries */ |
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/* SystemV4 super-block data on disk */ |
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struct sysv4_super_block { |
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__fs16 s_isize; /* index of first data zone */ |
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u16 s_pad0; |
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__fs32 s_fsize; /* total number of zones of this fs */ |
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/* the start of the free block list: */ |
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__fs16 s_nfree; /* number of free blocks in s_free, <= SYSV_NICFREE */ |
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u16 s_pad1; |
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sysv_zone_t s_free[SYSV_NICFREE]; /* first free block list chunk */ |
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/* the cache of free inodes: */ |
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__fs16 s_ninode; /* number of free inodes in s_inode, <= SYSV_NICINOD */ |
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u16 s_pad2; |
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sysv_ino_t s_inode[SYSV_NICINOD]; /* some free inodes */ |
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/* locks, not used by Linux: */ |
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char s_flock; /* lock during free block list manipulation */ |
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char s_ilock; /* lock during inode cache manipulation */ |
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char s_fmod; /* super-block modified flag */ |
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char s_ronly; /* flag whether fs is mounted read-only */ |
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__fs32 s_time; /* time of last super block update */ |
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__fs16 s_dinfo[4]; /* device information ?? */ |
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__fs32 s_tfree; /* total number of free zones */ |
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__fs16 s_tinode; /* total number of free inodes */ |
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u16 s_pad3; |
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char s_fname[6]; /* file system volume name */ |
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char s_fpack[6]; /* file system pack name */ |
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s32 s_fill[12]; |
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__fs32 s_state; /* file system state: 0x7c269d38-s_time means clean */ |
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s32 s_magic; /* version of file system */ |
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__fs32 s_type; /* type of file system: 1 for 512 byte blocks |
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2 for 1024 byte blocks */ |
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}; |
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/* SystemV2 super-block data on disk */ |
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struct sysv2_super_block { |
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__fs16 s_isize; /* index of first data zone */ |
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__fs32 s_fsize __packed2__; /* total number of zones of this fs */ |
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/* the start of the free block list: */ |
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__fs16 s_nfree; /* number of free blocks in s_free, <= SYSV_NICFREE */ |
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sysv_zone_t s_free[SYSV_NICFREE]; /* first free block list chunk */ |
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/* the cache of free inodes: */ |
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__fs16 s_ninode; /* number of free inodes in s_inode, <= SYSV_NICINOD */ |
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sysv_ino_t s_inode[SYSV_NICINOD]; /* some free inodes */ |
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/* locks, not used by Linux: */ |
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char s_flock; /* lock during free block list manipulation */ |
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char s_ilock; /* lock during inode cache manipulation */ |
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char s_fmod; /* super-block modified flag */ |
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char s_ronly; /* flag whether fs is mounted read-only */ |
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__fs32 s_time __packed2__; /* time of last super block update */ |
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__fs16 s_dinfo[4]; /* device information ?? */ |
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__fs32 s_tfree __packed2__; /* total number of free zones */ |
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__fs16 s_tinode; /* total number of free inodes */ |
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char s_fname[6]; /* file system volume name */ |
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char s_fpack[6]; /* file system pack name */ |
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s32 s_fill[14]; |
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__fs32 s_state; /* file system state: 0xcb096f43 means clean */ |
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s32 s_magic; /* version of file system */ |
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__fs32 s_type; /* type of file system: 1 for 512 byte blocks |
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2 for 1024 byte blocks */ |
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}; |
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/* V7 super-block data on disk */ |
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#define V7_NICINOD 100 /* number of inode cache entries */ |
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#define V7_NICFREE 50 /* number of free block list chunk entries */ |
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struct v7_super_block { |
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__fs16 s_isize; /* index of first data zone */ |
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__fs32 s_fsize __packed2__; /* total number of zones of this fs */ |
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/* the start of the free block list: */ |
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__fs16 s_nfree; /* number of free blocks in s_free, <= V7_NICFREE */ |
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sysv_zone_t s_free[V7_NICFREE]; /* first free block list chunk */ |
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/* the cache of free inodes: */ |
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__fs16 s_ninode; /* number of free inodes in s_inode, <= V7_NICINOD */ |
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sysv_ino_t s_inode[V7_NICINOD]; /* some free inodes */ |
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/* locks, not used by Linux or V7: */ |
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char s_flock; /* lock during free block list manipulation */ |
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char s_ilock; /* lock during inode cache manipulation */ |
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char s_fmod; /* super-block modified flag */ |
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char s_ronly; /* flag whether fs is mounted read-only */ |
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__fs32 s_time __packed2__; /* time of last super block update */ |
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/* the following fields are not maintained by V7: */ |
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__fs32 s_tfree __packed2__; /* total number of free zones */ |
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__fs16 s_tinode; /* total number of free inodes */ |
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__fs16 s_m; /* interleave factor */ |
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__fs16 s_n; /* interleave factor */ |
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char s_fname[6]; /* file system name */ |
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char s_fpack[6]; /* file system pack name */ |
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}; |
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/* Constants to aid sanity checking */ |
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/* This is not a hard limit, nor enforced by v7 kernel. It's actually just |
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* the limit used by Seventh Edition's ls, though is high enough to assume |
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* that no reasonable file system would have that much entries in root |
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* directory. Thus, if we see anything higher, we just probably got the |
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* endiannes wrong. */ |
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#define V7_NFILES 1024 |
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/* The disk addresses are three-byte (despite direct block addresses being |
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* aligned word-wise in inode). If the most significant byte is non-zero, |
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* something is most likely wrong (not a filesystem, bad bytesex). */ |
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#define V7_MAXSIZE 0x00ffffff |
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/* Coherent super-block data on disk */ |
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#define COH_NICINOD 100 /* number of inode cache entries */ |
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#define COH_NICFREE 64 /* number of free block list chunk entries */ |
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struct coh_super_block { |
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__fs16 s_isize; /* index of first data zone */ |
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__fs32 s_fsize __packed2__; /* total number of zones of this fs */ |
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/* the start of the free block list: */ |
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__fs16 s_nfree; /* number of free blocks in s_free, <= COH_NICFREE */ |
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sysv_zone_t s_free[COH_NICFREE] __packed2__; /* first free block list chunk */ |
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/* the cache of free inodes: */ |
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__fs16 s_ninode; /* number of free inodes in s_inode, <= COH_NICINOD */ |
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sysv_ino_t s_inode[COH_NICINOD]; /* some free inodes */ |
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/* locks, not used by Linux: */ |
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char s_flock; /* lock during free block list manipulation */ |
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char s_ilock; /* lock during inode cache manipulation */ |
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char s_fmod; /* super-block modified flag */ |
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char s_ronly; /* flag whether fs is mounted read-only */ |
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__fs32 s_time __packed2__; /* time of last super block update */ |
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__fs32 s_tfree __packed2__; /* total number of free zones */ |
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__fs16 s_tinode; /* total number of free inodes */ |
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__fs16 s_interleave_m; /* interleave factor */ |
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__fs16 s_interleave_n; |
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char s_fname[6]; /* file system volume name */ |
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char s_fpack[6]; /* file system pack name */ |
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__fs32 s_unique; /* zero, not used */ |
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}; |
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/* SystemV/Coherent inode data on disk */ |
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struct sysv_inode { |
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__fs16 i_mode; |
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__fs16 i_nlink; |
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__fs16 i_uid; |
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__fs16 i_gid; |
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__fs32 i_size; |
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u8 i_data[3*(10+1+1+1)]; |
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u8 i_gen; |
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__fs32 i_atime; /* time of last access */ |
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__fs32 i_mtime; /* time of last modification */ |
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__fs32 i_ctime; /* time of creation */ |
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}; |
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/* SystemV/Coherent directory entry on disk */ |
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#define SYSV_NAMELEN 14 /* max size of name in struct sysv_dir_entry */ |
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struct sysv_dir_entry { |
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sysv_ino_t inode; |
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char name[SYSV_NAMELEN]; /* up to 14 characters, the rest are zeroes */ |
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}; |
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#define SYSV_DIRSIZE sizeof(struct sysv_dir_entry) /* size of every directory entry */ |
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#endif /* _LINUX_SYSV_FS_H */
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