42 oˆÒÓ ƒ|MƒÑ¿Õ$"o/* SPDX-License-Identifier: GPL-2.0 */ #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: */