#ifndef _LINUX_FS_H #define _LINUX_FS_H /* * This file has definitions for some important file table * structures etc. * * This file is subject to the terms and conditions of the GNU General Public * License. See the file README.legal in the main directory of this archive * for more details. */ #include #include #include #include #include /* * It's silly to have NR_OPEN bigger than NR_FILE, but I'll fix * that later. Anyway, now the file code is no longer dependent * on bitmaps in unsigned longs, but uses the new fd_set structure.. * * Some programs (notably those using select()) may have to be * recompiled to take full advantage of the new limits.. */ #undef NR_OPEN #define NR_OPEN 256 #define NR_INODE 256 #define NR_FILE 128 #define NR_SUPER 16 #define NR_HASH 997 #define NR_FILE_LOCKS 32 #define BLOCK_SIZE 1024 #define BLOCK_SIZE_BITS 10 #define MAX_CHRDEV 32 #define MAX_BLKDEV 32 /* devices are as follows: (same as minix, so we can use the minix * file system. These are major numbers.) * * 0 - unnamed (minor 0 = true 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 * 12 - * 13 - * 14 - sound card (?) * 15 - */ #define UNNAMED_MAJOR 0 #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 unsigned long inode_init(unsigned long start, unsigned long end); #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 */ #define MS_REMOUNT 32 /* alter flags of a mounted FS */ /* * Flags that can be altered by MS_REMOUNT */ #define MS_RMT_MASK (MS_RDONLY) /* * Magic mount flag number. Has to be or-ed to the flag values. */ #define MS_MGC_VAL 0xC0ED0000 /* magic flag number to indicate "new" flags */ #define MS_MGC_MSK 0xffff0000 /* magic flag number mask */ /* * 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. * * Exception: MS_RDONLY is always applied to the entire file system. */ #define IS_RDONLY(inode) (((inode)->i_sb) && ((inode)->i_sb->s_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 BLKGETSIZE 4704 /* return device size */ #define BMAP_IOCTL 1 /* obsolete - kept for compatibility */ #define FIBMAP 1 /* bmap access */ #define FIGETBSZ 2 /* get the block size used for bmap */ /* these flags tell notify_change what is being changed */ #define NOTIFY_SIZE 1 #define NOTIFY_MODE 2 #define NOTIFY_TIME 4 #define NOTIFY_UIDGID 8 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 #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; struct inode * i_next, * i_prev; struct inode * i_hash_next, * i_hash_prev; struct inode * i_bound_to, * i_bound_by; 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 ext2_inode_info ext2_i; struct msdos_inode_info msdos_i; struct iso_inode_info isofs_i; struct nfs_inode_info nfs_i; struct xiafs_inode_info xiafs_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 #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 ext2_sb_info ext2_sb; struct msdos_sb_info msdos_sb; struct isofs_sb_info isofs_sb; struct nfs_sb_info nfs_sb; struct xiafs_sb_info xiafs_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); int (*select) (struct inode *, struct file *, int, select_table *); int (*ioctl) (struct inode *, struct file *, unsigned int, unsigned int); int (*mmap) (struct inode *, struct file *, unsigned long, size_t, int, unsigned long); int (*open) (struct inode *, struct file *); void (*release) (struct inode *, struct file *); int (*fsync) (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,int,struct inode **); int (*bmap) (struct inode *,int); void (*truncate) (struct inode *); int (*permission) (struct inode *, int); }; struct super_operations { void (*read_inode) (struct inode *); int (*notify_change) (int flags, struct inode *); void (*write_inode) (struct inode *); void (*put_inode) (struct inode *); void (*put_super) (struct super_block *); void (*write_super) (struct super_block *); void (*statfs) (struct super_block *, struct statfs *); }; struct file_system_type { struct super_block *(*read_super) (struct super_block *, void *, int); char *name; int requires_dev; }; extern int getname(const char * filename, char **result); extern void putname(char * name); extern int register_blkdev(unsigned int, const char *, struct file_operations *); extern int blkdev_open(struct inode * inode, struct file * filp); extern struct file_operations def_blk_fops; extern struct inode_operations blkdev_inode_operations; extern int register_chrdev(unsigned int, const char *, struct file_operations *); extern int chrdev_open(struct inode * inode, struct file * filp); extern struct file_operations def_chr_fops; extern struct inode_operations chrdev_inode_operations; extern void init_fifo(struct inode * inode); 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 buffermem; 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 notify_change(int flags, struct inode * inode); 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 void clear_inode(struct inode *); 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, int nr, 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 unsigned long bread_page(unsigned long addr,dev_t dev,int b[],int size,int prot); 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 read_ahead[]; extern int char_write(struct inode *, struct file *, char *, int); extern int block_write(struct inode *, struct file *, char *, int); #endif