#ifndef _LINUX_SYSV_FS_H #define _LINUX_SYSV_FS_H /* * The SystemV/Coherent filesystem constants/structures/macros */ /* This code assumes - sizeof(short) = 2, sizeof(int) = 4, sizeof(long) = 4, - alignof(short) = 2, alignof(long) = 4. */ #ifdef __GNUC__ #define __packed2__ __attribute__ ((packed, aligned(2))) #else #error I want gcc! #endif #include /* declares S_IFLNK etc. */ #include /* declares wake_up() */ #include /* defines the sv_... shortcuts */ /* Layout on disk */ /* ============== */ static inline u32 PDP_swab(u32 x) { #ifdef __LITTLE_ENDIAN return ((x & 0xffff) << 16) | ((x & 0xffff0000) >> 16); #else #ifdef __BIG_ENDIAN return ((x & 0xff00ff) << 8) | ((x & 0xff00ff00) >> 8); #else #error BYTESEX #endif #endif } /* inode numbers are 16 bit */ typedef u16 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 u32 sysv_zone_t; /* Among the blocks ... */ /* Xenix FS, Coherent FS: block 0 is the boot block, block 1 the super-block. SystemV FS: block 0 contains both the boot sector and the super-block. */ /* The first inode zone is sb->sv_firstinodezone (1 or 2). */ /* Among the inodes ... */ /* 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 { u16 s_isize; /* index of first data zone */ u32 s_fsize __packed2__; /* total number of zones of this fs */ /* the start of the free block list: */ u16 s_nfree; /* number of free blocks in s_free, <= XENIX_NICFREE */ u32 s_free[XENIX_NICFREE]; /* first free block list chunk */ /* the cache of free inodes: */ u16 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 */ u32 s_time __packed2__; /* time of last super block update */ u32 s_tfree __packed2__; /* total number of free zones */ u16 s_tinode; /* total number of free inodes */ s16 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 */ s32 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 { u16 s_isize; /* index of first data zone */ u16 s_pad0; u32 s_fsize; /* total number of zones of this fs */ /* the start of the free block list: */ u16 s_nfree; /* number of free blocks in s_free, <= SYSV_NICFREE */ u16 s_pad1; u32 s_free[SYSV_NICFREE]; /* first free block list chunk */ /* the cache of free inodes: */ u16 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 */ u32 s_time; /* time of last super block update */ s16 s_dinfo[4]; /* device information ?? */ u32 s_tfree; /* total number of free zones */ u16 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]; s32 s_state; /* file system state: 0x7c269d38-s_time means clean */ s32 s_magic; /* version of file system */ s32 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 { u16 s_isize; /* index of first data zone */ u32 s_fsize __packed2__; /* total number of zones of this fs */ /* the start of the free block list: */ u16 s_nfree; /* number of free blocks in s_free, <= SYSV_NICFREE */ u32 s_free[SYSV_NICFREE]; /* first free block list chunk */ /* the cache of free inodes: */ u16 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 */ u32 s_time __packed2__; /* time of last super block update */ s16 s_dinfo[4]; /* device information ?? */ u32 s_tfree __packed2__; /* total number of free zones */ u16 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]; s32 s_state; /* file system state: 0xcb096f43 means clean */ s32 s_magic; /* version of file system */ s32 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 { u16 s_isize; /* index of first data zone */ u32 s_fsize __packed2__; /* total number of zones of this fs */ /* the start of the free block list: */ u16 s_nfree; /* number of free blocks in s_free, <= V7_NICFREE */ u32 s_free[V7_NICFREE]; /* first free block list chunk */ /* the cache of free inodes: */ u16 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 */ u32 s_time __packed2__; /* time of last super block update */ /* the following fields are not maintained by V7: */ u32 s_tfree __packed2__; /* total number of free zones */ u16 s_tinode; /* total number of free inodes */ u16 s_m; /* interleave factor */ u16 s_n; /* interleave factor */ char s_fname[6]; /* file system name */ char s_fpack[6]; /* file system pack name */ }; /* 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 { u16 s_isize; /* index of first data zone */ u32 s_fsize __packed2__; /* total number of zones of this fs */ /* the start of the free block list: */ u16 s_nfree; /* number of free blocks in s_free, <= COH_NICFREE */ u32 s_free[COH_NICFREE] __packed2__; /* first free block list chunk */ /* the cache of free inodes: */ u16 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 */ u32 s_time __packed2__; /* time of last super block update */ u32 s_tfree __packed2__; /* total number of free zones */ u16 s_tinode; /* total number of free inodes */ u16 s_interleave_m; /* interleave factor */ u16 s_interleave_n; char s_fname[6]; /* file system volume name */ char s_fpack[6]; /* file system pack name */ u32 s_unique; /* zero, not used */ }; /* SystemV/Coherent inode data on disk */ struct sysv_inode { u16 i_mode; u16 i_nlink; u16 i_uid; u16 i_gid; u32 i_size; union { /* directories, regular files, ... */ unsigned char i_addb[3*(10+1+1+1)+1]; /* zone numbers: max. 10 data blocks, * then 1 indirection block, * then 1 double indirection block, * then 1 triple indirection block. * Then maybe a "file generation number" ?? */ /* named pipes on Coherent */ struct { char p_addp[30]; s16 p_pnc; s16 p_prx; s16 p_pwx; } i_p; } i_a; u32 i_atime; /* time of last access */ u32 i_mtime; /* time of last modification */ u32 i_ctime; /* time of creation */ }; /* Admissible values for i_nlink: 0.._LINK_MAX */ enum { XENIX_LINK_MAX = 126, /* ?? */ SYSV_LINK_MAX = 126, /* 127? 251? */ V7_LINK_MAX = 126, /* ?? */ COH_LINK_MAX = 10000, }; /* The number of inodes per block is sb->sv_inodes_per_block = block_size / sizeof(struct sysv_inode) */ /* The number of indirect pointers per block is sb->sv_ind_per_block = block_size / sizeof(u32) */ /* 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 */ /* Operations */ /* ========== */ /* identify the FS in memory */ enum { FSTYPE_NONE = 0, FSTYPE_XENIX, FSTYPE_SYSV4, FSTYPE_SYSV2, FSTYPE_COH, FSTYPE_V7, FSTYPE_AFS, FSTYPE_END, }; #define SYSV_MAGIC_BASE 0x012FF7B3 #define XENIX_SUPER_MAGIC (SYSV_MAGIC_BASE+FSTYPE_XENIX) #define SYSV4_SUPER_MAGIC (SYSV_MAGIC_BASE+FSTYPE_SYSV4) #define SYSV2_SUPER_MAGIC (SYSV_MAGIC_BASE+FSTYPE_SYSV2) #define COH_SUPER_MAGIC (SYSV_MAGIC_BASE+FSTYPE_COH) #ifdef __KERNEL__ enum { BYTESEX_LE, BYTESEX_PDP, BYTESEX_BE, }; /* * Function prototypes */ extern struct inode * sysv_new_inode(const struct inode *, mode_t); extern void sysv_free_inode(struct inode *); extern unsigned long sysv_count_free_inodes(struct super_block *); extern u32 sysv_new_block(struct super_block *); extern void sysv_free_block(struct super_block *, u32); extern unsigned long sysv_count_free_blocks(struct super_block *); extern void sysv_truncate(struct inode *); extern void sysv_write_inode(struct inode *, int); extern int sysv_sync_inode(struct inode *); extern int sysv_sync_file(struct file *, struct dentry *, int); extern void sysv_set_inode(struct inode *, dev_t); extern struct sysv_dir_entry *sysv_find_entry(struct dentry*, struct page**); extern int sysv_add_link(struct dentry*, struct inode*); extern int sysv_delete_entry(struct sysv_dir_entry*, struct page*); extern int sysv_make_empty(struct inode*, struct inode*); extern int sysv_empty_dir(struct inode*); extern void sysv_set_link(struct sysv_dir_entry*, struct page*, struct inode*); extern struct sysv_dir_entry *sysv_dotdot(struct inode*, struct page**); extern ino_t sysv_inode_by_name(struct dentry*); extern struct inode_operations sysv_file_inode_operations; extern struct inode_operations sysv_dir_inode_operations; extern struct inode_operations sysv_fast_symlink_inode_operations; extern struct file_operations sysv_file_operations; extern struct file_operations sysv_dir_operations; extern struct address_space_operations sysv_aops; extern struct super_operations sysv_sops; extern struct dentry_operations sysv_dentry_operations; extern struct sysv_inode *sysv_raw_inode(struct super_block *, unsigned, struct buffer_head **); static inline void dirty_sb(struct super_block *sb) { mark_buffer_dirty(sb->sv_bh1); if (sb->sv_bh1 != sb->sv_bh2) mark_buffer_dirty(sb->sv_bh2); sb->s_dirt = 1; } static inline u32 fs32_to_cpu(struct super_block *sb, u32 n) { if (sb->sv_bytesex == BYTESEX_PDP) return PDP_swab(n); else if (sb->sv_bytesex == BYTESEX_LE) return le32_to_cpu(n); else return be32_to_cpu(n); } static inline u32 cpu_to_fs32(struct super_block *sb, u32 n) { if (sb->sv_bytesex == BYTESEX_PDP) return PDP_swab(n); else if (sb->sv_bytesex == BYTESEX_LE) return cpu_to_le32(n); else return cpu_to_be32(n); } static inline u32 fs32_add(struct super_block *sb, u32 *n, int d) { if (sb->sv_bytesex == BYTESEX_PDP) return *n = PDP_swab(PDP_swab(*n)+d); else if (sb->sv_bytesex == BYTESEX_LE) return *n = cpu_to_le32(le32_to_cpu(*n)+d); else return *n = cpu_to_be32(be32_to_cpu(*n)+d); } static inline u16 fs16_to_cpu(struct super_block *sb, u16 n) { if (sb->sv_bytesex != BYTESEX_BE) return le16_to_cpu(n); else return be16_to_cpu(n); } static inline u16 cpu_to_fs16(struct super_block *sb, u16 n) { if (sb->sv_bytesex != BYTESEX_BE) return cpu_to_le16(n); else return cpu_to_be16(n); } static inline u16 fs16_add(struct super_block *sb, u16 *n, int d) { if (sb->sv_bytesex != BYTESEX_BE) return *n = cpu_to_le16(le16_to_cpu(*n)+d); else return *n = cpu_to_be16(be16_to_cpu(*n)+d); } #endif /* __KERNEL__ */ #endif