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203 lines
5.3 KiB
203 lines
5.3 KiB
2 years ago
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/*
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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 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 NAME_LEN 14
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#define ROOT_INO 1
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#define I_MAP_SLOTS 8
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#define Z_MAP_SLOTS 8
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#define SUPER_MAGIC 0x137F
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#define NR_OPEN 20
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#define NR_INODE 32
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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 INODES_PER_BLOCK ((BLOCK_SIZE)/(sizeof (struct d_inode)))
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#define DIR_ENTRIES_PER_BLOCK ((BLOCK_SIZE)/(sizeof (struct dir_entry)))
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#define PIPE_HEAD(inode) ((inode).i_zone[0])
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#define PIPE_TAIL(inode) ((inode).i_zone[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 INC_PIPE(head) \
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__asm__("incl %0\n\tandl $4095,%0"::"m" (head))
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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 d_inode {
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unsigned short i_mode;
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unsigned short i_uid;
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unsigned long i_size;
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unsigned long i_time;
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unsigned char i_gid;
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unsigned char i_nlinks;
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unsigned short i_zone[9];
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};
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struct m_inode {
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unsigned short i_mode;
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unsigned short i_uid;
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unsigned long i_size;
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unsigned long i_mtime;
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unsigned char i_gid;
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unsigned char i_nlinks;
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unsigned short i_zone[9];
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/* these are in memory also */
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struct task_struct * i_wait;
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unsigned long i_atime;
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unsigned long i_ctime;
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unsigned short i_dev;
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unsigned short i_num;
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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 m_inode * f_inode;
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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 m_inode * s_isup;
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struct m_inode * s_imount;
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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 d_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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};
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struct dir_entry {
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unsigned short inode;
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char name[NAME_LEN];
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};
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extern struct m_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 m_inode * inode);
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extern void sync_inodes(void);
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extern void wait_on(struct m_inode * inode);
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extern int bmap(struct m_inode * inode,int block);
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extern int create_block(struct m_inode * inode,int block);
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extern struct m_inode * namei(const char * pathname);
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extern int open_namei(const char * pathname, int flag, int mode,
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struct m_inode ** res_inode);
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extern void iput(struct m_inode * inode);
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extern struct m_inode * iget(int dev,int nr);
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extern struct m_inode * get_empty_inode(void);
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extern struct m_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 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 new_block(int dev);
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extern void free_block(int dev, int block);
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extern struct m_inode * new_inode(int dev);
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extern void free_inode(struct m_inode * inode);
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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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#endif
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