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Diffstat (limited to 'pfinet/linux-src/include/linux/sysv_fs.h')
| -rw-r--r-- | pfinet/linux-src/include/linux/sysv_fs.h | 414 |
1 files changed, 414 insertions, 0 deletions
diff --git a/pfinet/linux-src/include/linux/sysv_fs.h b/pfinet/linux-src/include/linux/sysv_fs.h new file mode 100644 index 00000000..49d9d24f --- /dev/null +++ b/pfinet/linux-src/include/linux/sysv_fs.h @@ -0,0 +1,414 @@ +#ifndef _LINUX_SYSV_FS_H +#define _LINUX_SYSV_FS_H + +/* + * The SystemV/Coherent filesystem constants/structures/macros + */ + + +/* This code assumes + - a little endian processor like 386, + - 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 <linux/stat.h> /* declares S_IFLNK etc. */ +#include <linux/sched.h> /* declares wake_up() */ +#include <linux/sysv_fs_sb.h> /* defines the sv_... shortcuts */ + + +/* Layout on disk */ +/* ============== */ + + +/* The block size is sb->sv_block_size which may be smaller than BLOCK_SIZE. */ + +/* zones (= data allocation units) are blocks */ + +/* On Coherent FS, 32 bit quantities are stored using (I quote the Coherent + manual) a "canonical byte ordering". This is the PDP-11 byte ordering: + x = 2^24 * byte3 + 2^16 * byte2 + 2^8 * byte1 + byte0 is stored + as { byte2, byte3, byte0, byte1 }. We need conversions. +*/ + +typedef u32 coh_ulong; + +static inline coh_ulong to_coh_ulong (u32 x) +{ + return ((x & 0xffff) << 16) | ((x & 0xffff0000) >> 16); +} + +static inline u32 from_coh_ulong (coh_ulong x) +{ + return ((x & 0xffff) << 16) | ((x & 0xffff0000) >> 16); +} + +/* 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 */ + +}; + +/* Xenix free list block on disk */ +struct xenix_freelist_chunk { + u16 fl_nfree; /* number of free blocks in fl_free, <= XENIX_NICFREE] */ + u32 fl_free[XENIX_NICFREE] __packed2__; +}; + +/* 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 */ +}; + +/* SystemV4 free list block on disk */ +struct sysv4_freelist_chunk { + u16 fl_nfree; /* number of free blocks in fl_free, <= SYSV_NICFREE] */ + u32 fl_free[SYSV_NICFREE]; +}; + +/* 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 */ +}; + +/* SystemV2 free list block on disk */ +struct sysv2_freelist_chunk { + u16 fl_nfree; /* number of free blocks in fl_free, <= SYSV_NICFREE] */ + u32 fl_free[SYSV_NICFREE] __packed2__; +}; + +/* 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 */ + coh_ulong 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 */ + coh_ulong 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 */ + coh_ulong s_time __packed2__; /* time of last super block update */ + coh_ulong 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 */ +}; + +/* Coherent free list block on disk */ +struct coh_freelist_chunk { + u16 fl_nfree; /* number of free blocks in fl_free, <= COH_NICFREE] */ + u32 fl_free[COH_NICFREE] __packed2__; +}; + + +/* 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" ?? + */ + /* devices */ + dev_t i_rdev; + /* 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 */ +}; + +/* The admissible values for i_mode are listed in <linux/stat.h> : + * #define S_IFMT 00170000 mask for type + * #define S_IFREG 0100000 type = regular file + * #define S_IFBLK 0060000 type = block device + * #define S_IFDIR 0040000 type = directory + * #define S_IFCHR 0020000 type = character device + * #define S_IFIFO 0010000 type = named pipe + * #define S_ISUID 0004000 set user id + * #define S_ISGID 0002000 set group id + * #define S_ISVTX 0001000 save swapped text even after use + * Additionally for SystemV: + * #define S_IFLNK 0120000 type = symbolic link + * #define S_IFNAM 0050000 type = XENIX special named file ?? + * Additionally for Coherent: + * #define S_IFMPB 0070000 type = multiplexed block device ?? + * #define S_IFMPC 0030000 type = multiplexed character device ?? + * + * Since Coherent doesn't know about symbolic links, we use a kludgey + * implementation of symbolic links: i_mode = COH_KLUDGE_SYMLINK_MODE + * denotes a symbolic link. When a regular file should get this mode by + * accident, it is automatically converted to COH_KLUDGE_NOT_SYMLINK. + * We use S_IFREG because only regular files (and Coherent pipes...) can have + * data blocks with arbitrary contents associated with them, and S_ISVTX + * ("save swapped text after use") because it is unused on both Linux and + * Coherent: Linux does much more intelligent paging, and Coherent hasn't + * virtual memory at all. + * Same trick for Xenix. + */ +#define COH_KLUDGE_SYMLINK_MODE (S_IFREG | S_ISVTX) +#define COH_KLUDGE_NOT_SYMLINK (S_IFREG | S_ISVTX | S_IRUSR) /* force read access */ +extern inline mode_t from_coh_imode(unsigned short mode) +{ + if (mode == COH_KLUDGE_SYMLINK_MODE) + return (S_IFLNK | 0777); + else + return mode; +} +extern inline unsigned short to_coh_imode(mode_t mode) +{ + if (S_ISLNK(mode)) + return COH_KLUDGE_SYMLINK_MODE; + else if (mode == COH_KLUDGE_SYMLINK_MODE) + return COH_KLUDGE_NOT_SYMLINK; + else + return mode; +} + +/* Admissible values for i_nlink: 0.._LINK_MAX */ +#define XENIX_LINK_MAX 126 /* ?? */ +#define SYSV_LINK_MAX 126 /* 127? 251? */ +#define COH_LINK_MAX 10000 /* max number of hard links to an inode */ + +/* 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 */ +#define FSTYPE_XENIX 1 +#define FSTYPE_SYSV4 2 +#define FSTYPE_SYSV2 3 +#define FSTYPE_COH 4 + +#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__ + +/* sv_get_hash_table(sb,dev,block) is equivalent to get_hash_table(dev,block,block_size) */ +static inline struct buffer_head * +sv_get_hash_table (struct super_block *sb, kdev_t dev, unsigned int block) +{ + return get_hash_table (dev, block + sb->sv_block_base, sb->sv_block_size); +} + +/* sv_getblk(sb,dev,block) is equivalent to getblk(dev,block,block_size) */ +static inline struct buffer_head * +sv_getblk (struct super_block *sb, kdev_t dev, unsigned int block) +{ + return getblk (dev, block + sb->sv_block_base, sb->sv_block_size); +} + +/* sv_bread(sb,dev,block) is equivalent to bread(dev,block,block_size) */ +static inline struct buffer_head * +sv_bread (struct super_block *sb, kdev_t dev, unsigned int block) +{ + return bread (dev, block + sb->sv_block_base, sb->sv_block_size); +} + + +/* + * Function prototypes + */ + +extern struct dentry *sysv_lookup(struct inode * dir, struct dentry * dentry); +extern int sysv_create(struct inode * dir, struct dentry * dentry, int mode); +extern int sysv_mkdir(struct inode * dir, struct dentry * dentry, int mode); +extern int sysv_rmdir(struct inode * dir, struct dentry * dentry); +extern int sysv_unlink(struct inode * dir, struct dentry * dentry); +extern int sysv_symlink(struct inode * inode, struct dentry * dentry, const char * symname); +extern int sysv_link(struct dentry * old_dentry, struct inode * dir, struct dentry * dentry); +extern int sysv_mknod(struct inode * dir, struct dentry * dentry, int mode, int rdev); +extern int sysv_rename(struct inode * old_dir, struct dentry * old_dentry, + struct inode * new_dir, struct dentry * new_dentry); +extern struct inode * sysv_new_inode(const struct inode * dir); +extern void sysv_free_inode(struct inode * inode); +extern unsigned long sysv_count_free_inodes(struct super_block *sb); +extern int sysv_new_block(struct super_block * sb); +extern void sysv_free_block(struct super_block * sb, unsigned int block); +extern unsigned long sysv_count_free_blocks(struct super_block *sb); + +extern int sysv_bmap(struct inode *,int); + +extern struct buffer_head * sysv_getblk(struct inode *, unsigned int, int); +extern struct buffer_head * sysv_file_bread(struct inode *, int, int); +extern ssize_t sysv_file_read(struct file *, char *, size_t, loff_t *); + +extern void sysv_truncate(struct inode *); +extern void sysv_put_super(struct super_block *); +extern struct super_block *sysv_read_super(struct super_block *,void *,int); +extern int init_sysv_fs(void); +extern void sysv_write_super(struct super_block *); +extern void sysv_read_inode(struct inode *); +extern int sysv_notify_change(struct dentry *, struct iattr *); +extern void sysv_write_inode(struct inode *); +extern int sysv_statfs(struct super_block *, struct statfs *, int); +extern int sysv_sync_inode(struct inode *); +extern int sysv_sync_file(struct file *, struct dentry *); +extern int sysv_mmap(struct file *, struct vm_area_struct *); + +extern struct inode_operations sysv_file_inode_operations; +extern struct inode_operations sysv_file_inode_operations_with_bmap; +extern struct inode_operations sysv_dir_inode_operations; +extern struct inode_operations sysv_symlink_inode_operations; + +#endif /* __KERNEL__ */ + +#endif + |