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1275 |
phoenix |
#ifndef _LINUX_SYSV_FS_H
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#define _LINUX_SYSV_FS_H
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/*
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* The SystemV/Coherent filesystem constants/structures/macros
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*/
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/* This code assumes
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- sizeof(short) = 2, sizeof(int) = 4, sizeof(long) = 4,
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- alignof(short) = 2, alignof(long) = 4.
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*/
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#ifdef __GNUC__
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#define __packed2__ __attribute__ ((packed, aligned(2)))
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#else
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#error I want gcc!
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#endif
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#include <linux/stat.h> /* declares S_IFLNK etc. */
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#include <linux/sched.h> /* declares wake_up() */
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#include <linux/sysv_fs_sb.h> /* defines the sv_... shortcuts */
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/* Layout on disk */
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/* ============== */
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static inline u32 PDP_swab(u32 x)
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{
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#ifdef __LITTLE_ENDIAN
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return ((x & 0xffff) << 16) | ((x & 0xffff0000) >> 16);
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#else
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#ifdef __BIG_ENDIAN
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return ((x & 0xff00ff) << 8) | ((x & 0xff00ff00) >> 8);
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#else
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#error BYTESEX
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#endif
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#endif
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}
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/* inode numbers are 16 bit */
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typedef u16 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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*/
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typedef u32 sysv_zone_t;
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/* Among the blocks ... */
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/* Xenix FS, Coherent FS: block 0 is the boot block, block 1 the super-block.
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SystemV FS: block 0 contains both the boot sector and the super-block. */
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/* The first inode zone is sb->sv_firstinodezone (1 or 2). */
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/* Among the inodes ... */
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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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u16 s_isize; /* index of first data zone */
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u32 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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u16 s_nfree; /* number of free blocks in s_free, <= XENIX_NICFREE */
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u32 s_free[XENIX_NICFREE]; /* first free block list chunk */
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/* the cache of free inodes: */
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u16 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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u32 s_time __packed2__; /* time of last super block update */
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u32 s_tfree __packed2__; /* total number of free zones */
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u16 s_tinode; /* total number of free inodes */
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s16 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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s32 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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/* 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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u16 s_isize; /* index of first data zone */
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u16 s_pad0;
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u32 s_fsize; /* total number of zones of this fs */
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/* the start of the free block list: */
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u16 s_nfree; /* number of free blocks in s_free, <= SYSV_NICFREE */
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u16 s_pad1;
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u32 s_free[SYSV_NICFREE]; /* first free block list chunk */
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/* the cache of free inodes: */
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u16 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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u32 s_time; /* time of last super block update */
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s16 s_dinfo[4]; /* device information ?? */
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u32 s_tfree; /* total number of free zones */
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u16 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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s32 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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s32 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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u16 s_isize; /* index of first data zone */
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u32 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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u16 s_nfree; /* number of free blocks in s_free, <= SYSV_NICFREE */
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u32 s_free[SYSV_NICFREE]; /* first free block list chunk */
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/* the cache of free inodes: */
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u16 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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u32 s_time __packed2__; /* time of last super block update */
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s16 s_dinfo[4]; /* device information ?? */
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u32 s_tfree __packed2__; /* total number of free zones */
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u16 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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s32 s_state; /* file system state: 0xcb096f43 means clean */
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s32 s_magic; /* version of file system */
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s32 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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u16 s_isize; /* index of first data zone */
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u32 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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u16 s_nfree; /* number of free blocks in s_free, <= V7_NICFREE */
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u32 s_free[V7_NICFREE]; /* first free block list chunk */
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/* the cache of free inodes: */
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u16 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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u32 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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u32 s_tfree __packed2__; /* total number of free zones */
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u16 s_tinode; /* total number of free inodes */
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u16 s_m; /* interleave factor */
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u16 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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/* 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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u16 s_isize; /* index of first data zone */
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u32 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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u16 s_nfree; /* number of free blocks in s_free, <= COH_NICFREE */
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u32 s_free[COH_NICFREE] __packed2__; /* first free block list chunk */
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/* the cache of free inodes: */
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u16 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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u32 s_time __packed2__; /* time of last super block update */
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u32 s_tfree __packed2__; /* total number of free zones */
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u16 s_tinode; /* total number of free inodes */
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u16 s_interleave_m; /* interleave factor */
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u16 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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u32 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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u16 i_mode;
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u16 i_nlink;
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u16 i_uid;
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u16 i_gid;
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u32 i_size;
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union { /* directories, regular files, ... */
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unsigned char i_addb[3*(10+1+1+1)+1]; /* zone numbers: max. 10 data blocks,
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* then 1 indirection block,
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* then 1 double indirection block,
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* then 1 triple indirection block.
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* Then maybe a "file generation number" ??
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*/
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/* named pipes on Coherent */
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struct {
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char p_addp[30];
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s16 p_pnc;
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s16 p_prx;
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s16 p_pwx;
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} i_p;
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} i_a;
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u32 i_atime; /* time of last access */
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u32 i_mtime; /* time of last modification */
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u32 i_ctime; /* time of creation */
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};
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| 243 |
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| 244 |
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/* Admissible values for i_nlink: 0.._LINK_MAX */
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enum {
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XENIX_LINK_MAX = 126, /* ?? */
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| 247 |
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SYSV_LINK_MAX = 126, /* 127? 251? */
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| 248 |
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V7_LINK_MAX = 126, /* ?? */
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| 249 |
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COH_LINK_MAX = 10000,
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| 250 |
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};
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| 251 |
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| 252 |
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/* The number of inodes per block is
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| 253 |
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sb->sv_inodes_per_block = block_size / sizeof(struct sysv_inode) */
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| 254 |
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/* The number of indirect pointers per block is
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| 255 |
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sb->sv_ind_per_block = block_size / sizeof(u32) */
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| 256 |
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| 257 |
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| 258 |
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/* SystemV/Coherent directory entry on disk */
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| 259 |
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| 260 |
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#define SYSV_NAMELEN 14 /* max size of name in struct sysv_dir_entry */
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| 261 |
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| 262 |
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struct sysv_dir_entry {
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| 263 |
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sysv_ino_t inode;
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| 264 |
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char name[SYSV_NAMELEN]; /* up to 14 characters, the rest are zeroes */
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| 265 |
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};
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| 266 |
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| 267 |
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#define SYSV_DIRSIZE sizeof(struct sysv_dir_entry) /* size of every directory entry */
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| 268 |
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| 269 |
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| 270 |
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/* Operations */
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| 271 |
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/* ========== */
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| 272 |
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| 273 |
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/* identify the FS in memory */
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| 274 |
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enum {
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| 275 |
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FSTYPE_NONE = 0,
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| 276 |
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FSTYPE_XENIX,
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| 277 |
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FSTYPE_SYSV4,
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| 278 |
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FSTYPE_SYSV2,
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| 279 |
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FSTYPE_COH,
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| 280 |
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FSTYPE_V7,
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| 281 |
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FSTYPE_AFS,
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| 282 |
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FSTYPE_END,
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| 283 |
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};
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| 284 |
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| 285 |
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#define SYSV_MAGIC_BASE 0x012FF7B3
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| 286 |
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| 287 |
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#define XENIX_SUPER_MAGIC (SYSV_MAGIC_BASE+FSTYPE_XENIX)
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| 288 |
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#define SYSV4_SUPER_MAGIC (SYSV_MAGIC_BASE+FSTYPE_SYSV4)
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| 289 |
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#define SYSV2_SUPER_MAGIC (SYSV_MAGIC_BASE+FSTYPE_SYSV2)
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| 290 |
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#define COH_SUPER_MAGIC (SYSV_MAGIC_BASE+FSTYPE_COH)
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| 291 |
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| 292 |
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#ifdef __KERNEL__
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| 293 |
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|
| 294 |
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enum {
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| 295 |
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BYTESEX_LE,
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| 296 |
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BYTESEX_PDP,
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| 297 |
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BYTESEX_BE,
|
| 298 |
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};
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| 299 |
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| 300 |
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/*
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| 301 |
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* Function prototypes
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| 302 |
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*/
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| 303 |
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| 304 |
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extern struct inode * sysv_new_inode(const struct inode *, mode_t);
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| 305 |
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extern void sysv_free_inode(struct inode *);
|
| 306 |
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extern unsigned long sysv_count_free_inodes(struct super_block *);
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| 307 |
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extern u32 sysv_new_block(struct super_block *);
|
| 308 |
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extern void sysv_free_block(struct super_block *, u32);
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| 309 |
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|
extern unsigned long sysv_count_free_blocks(struct super_block *);
|
| 310 |
|
|
|
| 311 |
|
|
extern void sysv_truncate(struct inode *);
|
| 312 |
|
|
|
| 313 |
|
|
extern void sysv_write_inode(struct inode *, int);
|
| 314 |
|
|
extern int sysv_sync_inode(struct inode *);
|
| 315 |
|
|
extern int sysv_sync_file(struct file *, struct dentry *, int);
|
| 316 |
|
|
extern void sysv_set_inode(struct inode *, dev_t);
|
| 317 |
|
|
|
| 318 |
|
|
extern struct sysv_dir_entry *sysv_find_entry(struct dentry*, struct page**);
|
| 319 |
|
|
extern int sysv_add_link(struct dentry*, struct inode*);
|
| 320 |
|
|
extern int sysv_delete_entry(struct sysv_dir_entry*, struct page*);
|
| 321 |
|
|
extern int sysv_make_empty(struct inode*, struct inode*);
|
| 322 |
|
|
extern int sysv_empty_dir(struct inode*);
|
| 323 |
|
|
extern void sysv_set_link(struct sysv_dir_entry*, struct page*, struct inode*);
|
| 324 |
|
|
extern struct sysv_dir_entry *sysv_dotdot(struct inode*, struct page**);
|
| 325 |
|
|
extern ino_t sysv_inode_by_name(struct dentry*);
|
| 326 |
|
|
|
| 327 |
|
|
extern struct inode_operations sysv_file_inode_operations;
|
| 328 |
|
|
extern struct inode_operations sysv_dir_inode_operations;
|
| 329 |
|
|
extern struct inode_operations sysv_fast_symlink_inode_operations;
|
| 330 |
|
|
extern struct file_operations sysv_file_operations;
|
| 331 |
|
|
extern struct file_operations sysv_dir_operations;
|
| 332 |
|
|
extern struct address_space_operations sysv_aops;
|
| 333 |
|
|
extern struct super_operations sysv_sops;
|
| 334 |
|
|
extern struct dentry_operations sysv_dentry_operations;
|
| 335 |
|
|
|
| 336 |
|
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extern struct sysv_inode *sysv_raw_inode(struct super_block *, unsigned, struct buffer_head **);
|
| 337 |
|
|
|
| 338 |
|
|
static inline void dirty_sb(struct super_block *sb)
|
| 339 |
|
|
{
|
| 340 |
|
|
mark_buffer_dirty(sb->sv_bh1);
|
| 341 |
|
|
if (sb->sv_bh1 != sb->sv_bh2)
|
| 342 |
|
|
mark_buffer_dirty(sb->sv_bh2);
|
| 343 |
|
|
sb->s_dirt = 1;
|
| 344 |
|
|
}
|
| 345 |
|
|
|
| 346 |
|
|
static inline u32 fs32_to_cpu(struct super_block *sb, u32 n)
|
| 347 |
|
|
{
|
| 348 |
|
|
if (sb->sv_bytesex == BYTESEX_PDP)
|
| 349 |
|
|
return PDP_swab(n);
|
| 350 |
|
|
else if (sb->sv_bytesex == BYTESEX_LE)
|
| 351 |
|
|
return le32_to_cpu(n);
|
| 352 |
|
|
else
|
| 353 |
|
|
return be32_to_cpu(n);
|
| 354 |
|
|
}
|
| 355 |
|
|
|
| 356 |
|
|
static inline u32 cpu_to_fs32(struct super_block *sb, u32 n)
|
| 357 |
|
|
{
|
| 358 |
|
|
if (sb->sv_bytesex == BYTESEX_PDP)
|
| 359 |
|
|
return PDP_swab(n);
|
| 360 |
|
|
else if (sb->sv_bytesex == BYTESEX_LE)
|
| 361 |
|
|
return cpu_to_le32(n);
|
| 362 |
|
|
else
|
| 363 |
|
|
return cpu_to_be32(n);
|
| 364 |
|
|
}
|
| 365 |
|
|
|
| 366 |
|
|
static inline u32 fs32_add(struct super_block *sb, u32 *n, int d)
|
| 367 |
|
|
{
|
| 368 |
|
|
if (sb->sv_bytesex == BYTESEX_PDP)
|
| 369 |
|
|
return *n = PDP_swab(PDP_swab(*n)+d);
|
| 370 |
|
|
else if (sb->sv_bytesex == BYTESEX_LE)
|
| 371 |
|
|
return *n = cpu_to_le32(le32_to_cpu(*n)+d);
|
| 372 |
|
|
else
|
| 373 |
|
|
return *n = cpu_to_be32(be32_to_cpu(*n)+d);
|
| 374 |
|
|
}
|
| 375 |
|
|
|
| 376 |
|
|
static inline u16 fs16_to_cpu(struct super_block *sb, u16 n)
|
| 377 |
|
|
{
|
| 378 |
|
|
if (sb->sv_bytesex != BYTESEX_BE)
|
| 379 |
|
|
return le16_to_cpu(n);
|
| 380 |
|
|
else
|
| 381 |
|
|
return be16_to_cpu(n);
|
| 382 |
|
|
}
|
| 383 |
|
|
|
| 384 |
|
|
static inline u16 cpu_to_fs16(struct super_block *sb, u16 n)
|
| 385 |
|
|
{
|
| 386 |
|
|
if (sb->sv_bytesex != BYTESEX_BE)
|
| 387 |
|
|
return cpu_to_le16(n);
|
| 388 |
|
|
else
|
| 389 |
|
|
return cpu_to_be16(n);
|
| 390 |
|
|
}
|
| 391 |
|
|
|
| 392 |
|
|
static inline u16 fs16_add(struct super_block *sb, u16 *n, int d)
|
| 393 |
|
|
{
|
| 394 |
|
|
if (sb->sv_bytesex != BYTESEX_BE)
|
| 395 |
|
|
return *n = cpu_to_le16(le16_to_cpu(*n)+d);
|
| 396 |
|
|
else
|
| 397 |
|
|
return *n = cpu_to_be16(be16_to_cpu(*n)+d);
|
| 398 |
|
|
}
|
| 399 |
|
|
|
| 400 |
|
|
#endif /* __KERNEL__ */
|
| 401 |
|
|
|
| 402 |
|
|
#endif
|
