210 lines
6.3 KiB
C
210 lines
6.3 KiB
C
/*
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* This file has definitions for some important file table
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* structures etc.
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*/
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#ifndef _FS_H
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#define _FS_H
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#include <sys/types.h>
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/* devices are as follows: (same as minix, so we can use the minix
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* file system. These are major numbers.)
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*
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* 0 - unused (nodev)
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* 1 - /dev/mem
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* 2 - /dev/fd
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* 3 - /dev/hd
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* 4 - /dev/ttyx
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* 5 - /dev/tty
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* 6 - /dev/lp
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* 7 - unnamed pipes
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*/
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#define IS_SEEKABLE(x) ((x)>=1 && (x)<=3)
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#define MAY_EXEC 1
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#define MAY_WRITE 2
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#define MAY_READ 4
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#define READ 0
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#define WRITE 1
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#define READA 2 /* read-ahead - don't pause */
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#define WRITEA 3 /* "write-ahead" - silly, but somewhat useful */
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void buffer_init(long buffer_end);
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#define MAJOR(a) (((unsigned)(a))>>8)
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#define MINOR(a) ((a)&0xff)
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#define NR_OPEN 20
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#define NR_INODE 128
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#define NR_FILE 64
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#define NR_SUPER 8
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#define NR_HASH 307
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#define NR_BUFFERS nr_buffers
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#define BLOCK_SIZE 1024
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#define BLOCK_SIZE_BITS 10
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#ifndef NULL
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#define NULL ((void *) 0)
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#endif
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#define PIPE_READ_WAIT(inode) ((inode).i_wait)
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#define PIPE_WRITE_WAIT(inode) ((inode).i_wait2)
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#define PIPE_HEAD(inode) ((inode).i_data[0])
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#define PIPE_TAIL(inode) ((inode).i_data[1])
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#define PIPE_SIZE(inode) ((PIPE_HEAD(inode)-PIPE_TAIL(inode))&(PAGE_SIZE-1))
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#define PIPE_EMPTY(inode) (PIPE_HEAD(inode)==PIPE_TAIL(inode))
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#define PIPE_FULL(inode) (PIPE_SIZE(inode)==(PAGE_SIZE-1))
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#define NIL_FILP ((struct file *)0)
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#define SEL_IN 1
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#define SEL_OUT 2
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#define SEL_EX 4
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typedef char buffer_block[BLOCK_SIZE];
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struct buffer_head {
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char * b_data; /* pointer to data block (1024 bytes) */
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unsigned long b_blocknr; /* block number */
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unsigned short b_dev; /* device (0 = free) */
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unsigned char b_uptodate;
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unsigned char b_dirt; /* 0-clean,1-dirty */
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unsigned char b_count; /* users using this block */
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unsigned char b_lock; /* 0 - ok, 1 -locked */
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struct task_struct * b_wait;
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struct buffer_head * b_prev;
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struct buffer_head * b_next;
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struct buffer_head * b_prev_free;
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struct buffer_head * b_next_free;
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};
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struct inode {
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dev_t i_dev;
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ino_t i_ino;
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umode_t i_mode;
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nlink_t i_nlink;
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uid_t i_uid;
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gid_t i_gid;
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dev_t i_rdev;
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off_t i_size;
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time_t i_atime;
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time_t i_mtime;
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time_t i_ctime;
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unsigned long i_data[16];
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struct inode_operations * i_op;
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struct super_block * i_sb;
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struct task_struct * i_wait;
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struct task_struct * i_wait2; /* for pipes */
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unsigned short i_count;
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unsigned char i_lock;
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unsigned char i_dirt;
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unsigned char i_pipe;
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unsigned char i_mount;
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unsigned char i_seek;
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unsigned char i_update;
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};
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struct file {
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unsigned short f_mode;
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unsigned short f_flags;
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unsigned short f_count;
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struct inode * f_inode;
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struct file_operations * f_op;
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off_t f_pos;
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};
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struct super_block {
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unsigned short s_ninodes;
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unsigned short s_nzones;
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unsigned short s_imap_blocks;
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unsigned short s_zmap_blocks;
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unsigned short s_firstdatazone;
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unsigned short s_log_zone_size;
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unsigned long s_max_size;
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unsigned short s_magic;
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/* These are only in memory */
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struct buffer_head * s_imap[8];
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struct buffer_head * s_zmap[8];
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unsigned short s_dev;
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struct inode * s_covered;
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struct inode * s_mounted;
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unsigned long s_time;
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struct task_struct * s_wait;
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unsigned char s_lock;
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unsigned char s_rd_only;
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unsigned char s_dirt;
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};
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struct file_operations {
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int (*lseek) (struct inode *, struct file *, off_t, int);
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int (*read) (struct inode *, struct file *, char *, int);
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int (*write) (struct inode *, struct file *, char *, int);
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};
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struct inode_operations {
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int (*create) (struct inode *,const char *,int,int,struct inode **);
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int (*lookup) (struct inode *,const char *,int,struct inode **);
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int (*link) (struct inode *,struct inode *,const char *,int);
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int (*unlink) (struct inode *,const char *,int);
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int (*symlink) (struct inode *,const char *,int,const char *);
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int (*mkdir) (struct inode *,const char *,int,int);
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int (*rmdir) (struct inode *,const char *,int);
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int (*mknod) (struct inode *,const char *,int,int,int);
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int (*rename) (struct inode *,const char *,int,struct inode *,const char *,int);
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int (*readlink) (struct inode *,char *,int);
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int (*open) (struct inode *, struct file *);
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void (*release) (struct inode *, struct file *);
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struct inode * (*follow_link) (struct inode *, struct inode *);
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};
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extern struct inode inode_table[NR_INODE];
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extern struct file file_table[NR_FILE];
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extern struct super_block super_block[NR_SUPER];
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extern struct buffer_head * start_buffer;
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extern int nr_buffers;
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extern void check_disk_change(int dev);
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extern int floppy_change(unsigned int nr);
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extern int ticks_to_floppy_on(unsigned int dev);
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extern void floppy_on(unsigned int dev);
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extern void floppy_off(unsigned int dev);
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extern void truncate(struct inode * inode);
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extern void sync_inodes(void);
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extern void wait_on(struct inode * inode);
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extern int bmap(struct inode * inode,int block);
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extern struct inode * namei(const char * pathname);
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extern struct inode * lnamei(const char * pathname);
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extern int open_namei(const char * pathname, int flag, int mode,
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struct inode ** res_inode);
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extern void iput(struct inode * inode);
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extern struct inode * iget(int dev,int nr);
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extern struct inode * get_empty_inode(void);
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extern struct inode * get_pipe_inode(void);
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extern struct buffer_head * get_hash_table(int dev, int block);
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extern struct buffer_head * getblk(int dev, int block);
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extern void ll_rw_block(int rw, struct buffer_head * bh);
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extern void ll_rw_page(int rw, int dev, int nr, char * buffer);
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extern void ll_rw_swap_file(int rw, int dev, unsigned int *b, int nb, char *buffer);
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extern void brelse(struct buffer_head * buf);
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extern struct buffer_head * bread(int dev,int block);
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extern void bread_page(unsigned long addr,int dev,int b[4]);
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extern struct buffer_head * breada(int dev,int block,...);
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extern int sync_dev(int dev);
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extern struct super_block * get_super(int dev);
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extern int ROOT_DEV;
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extern void mount_root(void);
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extern int minix_file_read(struct inode *, struct file *, char *, int);
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extern int pipe_read(struct inode *, struct file *, char *, int);
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extern int char_read(struct inode *, struct file *, char *, int);
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extern int block_read(struct inode *, struct file *, char *, int);
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extern int minix_file_write(struct inode *, struct file *, char *, int);
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extern int pipe_write(struct inode *, struct file *, char *, int);
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extern int char_write(struct inode *, struct file *, char *, int);
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extern int block_write(struct inode *, struct file *, char *, int);
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#endif
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