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0bcaa65a56
Newly mkfs-ed filesystems from Seventh Edition have last modification time set to zero, but are otherwise perfectly valid. Also, tighten up other sanity checks to filter out most filesystems with [akpm@linux-foundation.org: coding-style fixes] Signed-off-by: Lubomir Rintel <lkundrak@v3.sk> Cc: Christoph Hellwig <hch@lst.de> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
213 lines
9 KiB
C
213 lines
9 KiB
C
#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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