#ifndef _LINUX_FS_H #define _LINUX_FS_H /* * This file has definitions for some important file table * structures etc. */ #include #include #include #include #include /* devices are as follows: (same as minix, so we can use the minix * file system. These are major numbers.) * * 0 - unused (nodev) * 1 - /dev/mem * 2 - /dev/fd * 3 - /dev/hd * 4 - /dev/ttyx * 5 - /dev/tty * 6 - /dev/lp * 7 - * 8 - /dev/sd * 9 - /dev/st * 10 - mice * 11 - scsi cdrom */ #define MAY_EXEC 1 #define MAY_WRITE 2 #define MAY_READ 4 #define READ 0 #define WRITE 1 #define READA 2 /* read-ahead - don't pause */ #define WRITEA 3 /* "write-ahead" - silly, but somewhat useful */ extern void buffer_init(void); extern void inode_init(void); #define MAJOR(a) (((unsigned)(a))>>8) #define MINOR(a) ((a)&0xff) #ifndef NULL #define NULL ((void *) 0) #endif #define NIL_FILP ((struct file *)0) #define SEL_IN 1 #define SEL_OUT 2 #define SEL_EX 4 /* * These are the fs-independent mount-flags: up to 16 flags are supported */ #define MS_RDONLY 1 /* mount read-only */ #define MS_NOSUID 2 /* ignore suid and sgid bits */ #define MS_NODEV 4 /* disallow access to device special files */ #define MS_NOEXEC 8 /* disallow program execution */ #define MS_SYNC 16 /* writes are synced at once */ /* * Note that read-only etc flags are inode-specific: setting some file-system * flags just means all the inodes inherit those flags by default. It might be * possible to overrride it sevelctively if you really wanted to with some * ioctl() that is not currently implemented. */ #define IS_RDONLY(inode) ((inode)->i_flags & MS_RDONLY) #define IS_NOSUID(inode) ((inode)->i_flags & MS_NOSUID) #define IS_NODEV(inode) ((inode)->i_flags & MS_NODEV) #define IS_NOEXEC(inode) ((inode)->i_flags & MS_NOEXEC) #define IS_SYNC(inode) ((inode)->i_flags & MS_SYNC) /* the read-only stuff doesn't really belong here, but any other place is probably as bad and I don't want to create yet another include file. */ #define BLKROSET 4701 /* set device read-only (0 = read-write) */ #define BLKROGET 4702 /* get read-only status (0 = read_write) */ #define BLKRRPART 4703 /* re-read partition table */ #define BMAP_IOCTL 1 /* obsolete - kept for compatibility */ #define FIBMAP 1 /* bmap access */ #define FIGETBSZ 2 /* get the block size used for bmap */ typedef char buffer_block[BLOCK_SIZE]; struct buffer_head { char * b_data; /* pointer to data block (1024 bytes) */ unsigned long b_size; /* block size */ unsigned long b_blocknr; /* block number */ dev_t b_dev; /* device (0 = free) */ unsigned short b_count; /* users using this block */ unsigned char b_uptodate; unsigned char b_dirt; /* 0-clean,1-dirty */ unsigned char b_lock; /* 0 - ok, 1 -locked */ struct wait_queue * b_wait; struct buffer_head * b_prev; /* doubly linked list of hash-queue */ struct buffer_head * b_next; struct buffer_head * b_prev_free; /* doubly linked list of buffers */ struct buffer_head * b_next_free; struct buffer_head * b_this_page; /* circular list of buffers in one page */ struct buffer_head * b_reqnext; /* request queue */ }; #include #include #include #include #include struct inode { dev_t i_dev; unsigned long i_ino; umode_t i_mode; nlink_t i_nlink; uid_t i_uid; gid_t i_gid; dev_t i_rdev; off_t i_size; time_t i_atime; time_t i_mtime; time_t i_ctime; unsigned long i_blksize; unsigned long i_blocks; struct inode_operations * i_op; struct super_block * i_sb; struct wait_queue * i_wait; struct file_lock * i_flock; struct vm_area_struct * i_mmap; unsigned short i_count; unsigned short i_flags; unsigned char i_lock; unsigned char i_dirt; unsigned char i_pipe; unsigned char i_mount; unsigned char i_seek; unsigned char i_update; union { struct pipe_inode_info pipe_i; struct minix_inode_info minix_i; struct ext_inode_info ext_i; struct msdos_inode_info msdos_i; struct iso_inode_info isofs_i; } u; }; struct file { mode_t f_mode; dev_t f_rdev; /* needed for /dev/tty */ off_t f_pos; unsigned short f_flags; unsigned short f_count; unsigned short f_reada; struct inode * f_inode; struct file_operations * f_op; }; struct file_lock { struct file_lock *fl_next; /* singly linked list */ struct task_struct *fl_owner; /* NULL if on free list, for sanity checks */ struct wait_queue *fl_wait; char fl_type; char fl_whence; off_t fl_start; off_t fl_end; }; #include #include #include #include struct super_block { dev_t s_dev; unsigned long s_blocksize; unsigned char s_lock; unsigned char s_rd_only; unsigned char s_dirt; struct super_operations *s_op; unsigned long s_flags; unsigned long s_magic; unsigned long s_time; struct inode * s_covered; struct inode * s_mounted; struct wait_queue * s_wait; union { struct minix_sb_info minix_sb; struct ext_sb_info ext_sb; struct msdos_sb_info msdos_sb; struct isofs_sb_info isofs_sb; } u; }; struct file_operations { int (*lseek) (struct inode *, struct file *, off_t, int); int (*read) (struct inode *, struct file *, char *, int); int (*write) (struct inode *, struct file *, char *, int); int (*readdir) (struct inode *, struct file *, struct dirent *, int count); int (*select) (struct inode *, struct file *, int, select_table *); int (*ioctl) (struct inode *, struct file *, unsigned int, unsigned int); int (*mmap) (void); int (*open) (struct inode *, struct file *); void (*release) (struct inode *, struct file *); }; struct inode_operations { struct file_operations * default_file_ops; int (*create) (struct inode *,const char *,int,int,struct inode **); int (*lookup) (struct inode *,const char *,int,struct inode **); int (*link) (struct inode *,struct inode *,const char *,int); int (*unlink) (struct inode *,const char *,int); int (*symlink) (struct inode *,const char *,int,const char *); int (*mkdir) (struct inode *,const char *,int,int); int (*rmdir) (struct inode *,const char *,int); int (*mknod) (struct inode *,const char *,int,int,int); int (*rename) (struct inode *,const char *,int,struct inode *,const char *,int); int (*readlink) (struct inode *,char *,int); int (*follow_link) (struct inode *, struct inode *, int flag, int mode, struct inode ** res_inode); int (*bmap) (struct inode *,int); void (*truncate) (struct inode *); }; struct super_operations { void (*read_inode)(struct inode *inode); void (*write_inode) (struct inode *inode); void (*put_inode) (struct inode *inode); void (*put_super)(struct super_block *sb); void (*write_super) (struct super_block *sb); void (*statfs) (struct super_block *sb, struct statfs *buf); }; struct file_system_type { struct super_block *(*read_super)(struct super_block *sb,void *mode); char *name; }; extern struct file_operations * chrdev_fops[MAX_CHRDEV]; extern struct file_operations * blkdev_fops[MAX_BLKDEV]; extern struct file_system_type *get_fs_type(char *name); extern int fs_may_mount(dev_t dev); extern int fs_may_umount(dev_t dev, struct inode * mount_root); extern struct file file_table[NR_FILE]; extern struct super_block super_block[NR_SUPER]; extern void grow_buffers(int size); extern int shrink_buffers(unsigned int priority); extern int nr_buffers; extern int nr_buffer_heads; extern void check_disk_change(dev_t dev); extern void invalidate_inodes(dev_t dev); extern void invalidate_buffers(dev_t dev); extern int floppy_change(struct buffer_head * first_block); extern int ticks_to_floppy_on(unsigned int dev); extern void floppy_on(unsigned int dev); extern void floppy_off(unsigned int dev); extern void sync_inodes(dev_t dev); extern void sync_dev(dev_t dev); extern void sync_supers(dev_t dev); extern int bmap(struct inode * inode,int block); extern int namei(const char * pathname, struct inode ** res_inode); extern int lnamei(const char * pathname, struct inode ** res_inode); extern int permission(struct inode * inode,int mask); extern int open_namei(const char * pathname, int flag, int mode, struct inode ** res_inode, struct inode * base); extern int do_mknod(const char * filename, int mode, dev_t dev); extern void iput(struct inode * inode); extern struct inode * iget(struct super_block * sb,int nr); extern struct inode * get_empty_inode(void); extern struct inode * get_pipe_inode(void); extern struct file * get_empty_filp(void); extern struct buffer_head * get_hash_table(dev_t dev, int block, int size); extern struct buffer_head * getblk(dev_t dev, int block, int size); extern void ll_rw_block(int rw, struct buffer_head * bh); extern void ll_rw_page(int rw, int dev, int nr, char * buffer); extern void ll_rw_swap_file(int rw, int dev, unsigned int *b, int nb, char *buffer); extern void brelse(struct buffer_head * buf); extern struct buffer_head * bread(dev_t dev, int block, int size); extern void bread_page(unsigned long addr,dev_t dev,int b[4]); extern struct buffer_head * breada(dev_t dev,int block,...); extern void put_super(dev_t dev); extern dev_t ROOT_DEV; extern void mount_root(void); extern int char_read(struct inode *, struct file *, char *, int); extern int block_read(struct inode *, struct file *, char *, int); extern int char_write(struct inode *, struct file *, char *, int); extern int block_write(struct inode *, struct file *, char *, int); #endif