लिनक्स/linux-0.01.tar/include/linux/fs.h
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/* * This file has definitions for some important file table * structures etc. */ #ifndef _FS_H #define _FS_H #include <sys/types.h> /* 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 - unnamed pipes */ #define IS_BLOCKDEV(x) ((x)==2 || (x)==3) #define READ 0 #define WRITE 1 void buffer_init(void); #define MAJOR(a) (((unsigned)(a))>>8) #define MINOR(a) ((a)&0xff) #define NAME_LEN 14 #define I_MAP_SLOTS 8 #define Z_MAP_SLOTS 8 #define SUPER_MAGIC 0x137F #define NR_OPEN 20 #define NR_INODE 32 #define NR_FILE 64 #define NR_SUPER 8 #define NR_HASH 307 #define NR_BUFFERS nr_buffers #define BLOCK_SIZE 1024 #ifndef NULL #define NULL ((void *) 0) #endif #define INODES_PER_BLOCK ((BLOCK_SIZE)/(sizeof (struct d_inode))) #define DIR_ENTRIES_PER_BLOCK ((BLOCK_SIZE)/(sizeof (struct dir_entry))) typedef char buffer_block[BLOCK_SIZE]; struct buffer_head { char * b_data; /* pointer to data block (1024 bytes) */ unsigned short b_dev; /* device (0 = free) */ unsigned short b_blocknr; /* block number */ unsigned char b_uptodate; unsigned char b_dirt; /* 0-clean,1-dirty */ unsigned char b_count; /* users using this block */ unsigned char b_lock; /* 0 - ok, 1 -locked */ struct task_struct * b_wait; struct buffer_head * b_prev; struct buffer_head * b_next; struct buffer_head * b_prev_free; struct buffer_head * b_next_free; }; struct d_inode { unsigned short i_mode; unsigned short i_uid; unsigned long i_size; unsigned long i_time; unsigned char i_gid; unsigned char i_nlinks; unsigned short i_zone[9]; }; struct m_inode { unsigned short i_mode; unsigned short i_uid; unsigned long i_size; unsigned long i_mtime; unsigned char i_gid; unsigned char i_nlinks; unsigned short i_zone[9]; /* these are in memory also */ struct task_struct * i_wait; unsigned long i_atime; unsigned long i_ctime; unsigned short i_dev; unsigned short i_num; unsigned short i_count; unsigned char i_lock; unsigned char i_dirt; unsigned char i_pipe; unsigned char i_mount; unsigned char i_seek; unsigned char i_update; }; #define PIPE_HEAD(inode) (((long *)((inode).i_zone))[0]) #define PIPE_TAIL(inode) (((long *)((inode).i_zone))[1]) #define PIPE_SIZE(inode) ((PIPE_HEAD(inode)-PIPE_TAIL(inode))&(PAGE_SIZE-1)) #define PIPE_EMPTY(inode) (PIPE_HEAD(inode)==PIPE_TAIL(inode)) #define PIPE_FULL(inode) (PIPE_SIZE(inode)==(PAGE_SIZE-1)) #define INC_PIPE(head) \ __asm__("incl %0\n\tandl $4095,%0"::"m" (head)) struct file { unsigned short f_mode; unsigned short f_flags; unsigned short f_count; struct m_inode * f_inode; off_t f_pos; }; struct super_block { unsigned short s_ninodes; unsigned short s_nzones; unsigned short s_imap_blocks; unsigned short s_zmap_blocks; unsigned short s_firstdatazone; unsigned short s_log_zone_size; unsigned long s_max_size; unsigned short s_magic; /* These are only in memory */ struct buffer_head * s_imap[8]; struct buffer_head * s_zmap[8]; unsigned short s_dev; struct m_inode * s_isup; struct m_inode * s_imount; unsigned long s_time; unsigned char s_rd_only; unsigned char s_dirt; }; struct dir_entry { unsigned short inode; char name[NAME_LEN]; }; extern struct m_inode inode_table[NR_INODE]; extern struct file file_table[NR_FILE]; extern struct super_block super_block[NR_SUPER]; extern struct buffer_head * start_buffer; extern int nr_buffers; extern void truncate(struct m_inode * inode); extern void sync_inodes(void); extern void wait_on(struct m_inode * inode); extern int bmap(struct m_inode * inode,int block); extern int create_block(struct m_inode * inode,int block); extern struct m_inode * namei(const char * pathname); extern int open_namei(const char * pathname, int flag, int mode, struct m_inode ** res_inode); extern void iput(struct m_inode * inode); extern struct m_inode * iget(int dev,int nr); extern struct m_inode * get_empty_inode(void); extern struct m_inode * get_pipe_inode(void); extern struct buffer_head * get_hash_table(int dev, int block); extern struct buffer_head * getblk(int dev, int block); extern void ll_rw_block(int rw, struct buffer_head * bh); extern void brelse(struct buffer_head * buf); extern struct buffer_head * bread(int dev,int block); extern int new_block(int dev); extern void free_block(int dev, int block); extern struct m_inode * new_inode(int dev); extern void free_inode(struct m_inode * inode); extern void mount_root(void); extern inline struct super_block * get_super(int dev) { struct super_block * s; for(s = 0+super_block;s < NR_SUPER+super_block; s++) if (s->s_dev == dev) return s; return NULL; } #endif