fs.h

来自「GNU Hurd 源代码」· C头文件 代码 · 共 911 行 · 第 1/2 页

	struct wait_queue *fl_wait;
	struct file *fl_file;
	unsigned char fl_flags;
	unsigned char fl_type;
	off_t fl_start;
	off_t fl_end;

	void (*fl_notify)(struct file_lock *);	/* unblock callback */

	union {
		struct nfs_lock_info	nfs_fl;
	} fl_u;
};

extern struct file_lock			*file_lock_table;

#include <linux/fcntl.h>

extern int fcntl_getlk(unsigned int fd, struct flock *l);
extern int fcntl_setlk(unsigned int fd, unsigned int cmd, struct flock *l);

/* fs/locks.c */
extern void locks_remove_posix(struct file *, fl_owner_t id);
extern void locks_remove_flock(struct file *);
extern struct file_lock *posix_test_lock(struct file *, struct file_lock *);
extern int posix_lock_file(struct file *, struct file_lock *, unsigned int);
extern void posix_block_lock(struct file_lock *, struct file_lock *);
extern void posix_unblock_lock(struct file_lock *);

struct fasync_struct {
	int    magic;
	int    fa_fd;
	struct fasync_struct	*fa_next; /* singly linked list */
	struct file 		*fa_file;
};

#define FASYNC_MAGIC 0x4601

extern int fasync_helper(int, struct file *, int, struct fasync_struct **);

#include <linux/minix_fs_sb.h>
#include <linux/ext2_fs_sb.h>
#include <linux/hpfs_fs_sb.h>
#include <linux/ntfs_fs_sb.h>
#include <linux/msdos_fs_sb.h>
#include <linux/iso_fs_sb.h>
#include <linux/nfs_fs_sb.h>
#include <linux/sysv_fs_sb.h>
#include <linux/affs_fs_sb.h>
#include <linux/ufs_fs_sb.h>
#include <linux/efs_fs_sb.h>
#include <linux/romfs_fs_sb.h>
#include <linux/smb_fs_sb.h>
#include <linux/hfs_fs_sb.h>
#include <linux/adfs_fs_sb.h>
#include <linux/qnx4_fs_sb.h>

extern struct list_head super_blocks;

#define sb_entry(list)	list_entry((list), struct super_block, s_list)
struct super_block {
	struct list_head	s_list;		/* Keep this first */
	kdev_t			s_dev;
	unsigned long		s_blocksize;
	unsigned char		s_blocksize_bits;
	unsigned char		s_lock;
	unsigned char		s_rd_only;
	unsigned char		s_dirt;
	struct file_system_type	*s_type;
	struct super_operations	*s_op;
	struct dquot_operations	*dq_op;
	unsigned long		s_flags;
	unsigned long		s_magic;
	unsigned long		s_time;
	struct dentry		*s_root;
	struct wait_queue	*s_wait;

	struct inode		*s_ibasket;
	short int		s_ibasket_count;
	short int		s_ibasket_max;
	struct list_head	s_dirty;	/* dirty inodes */

	union {
		struct minix_sb_info	minix_sb;
		struct ext2_sb_info	ext2_sb;
		struct hpfs_sb_info	hpfs_sb;
		struct ntfs_sb_info     ntfs_sb;
		struct msdos_sb_info	msdos_sb;
		struct isofs_sb_info	isofs_sb;
		struct nfs_sb_info	nfs_sb;
		struct sysv_sb_info	sysv_sb;
		struct affs_sb_info	affs_sb;
		struct ufs_sb_info	ufs_sb;
		struct efs_sb_info	efs_sb;
		struct romfs_sb_info	romfs_sb;
		struct smb_sb_info	smbfs_sb;
		struct hfs_sb_info	hfs_sb;
		struct adfs_sb_info	adfs_sb;
		struct qnx4_sb_info	qnx4_sb;	   
		void			*generic_sbp;
	} u;
	/*
	 * The next field is for VFS *only*. No filesystems have any business
	 * even looking at it. You had been warned.
	 */
	struct semaphore s_vfs_rename_sem;	/* Kludge */
};

/*
 * VFS helper functions..
 */
extern int vfs_rmdir(struct inode *, struct dentry *);
extern int vfs_unlink(struct inode *, struct dentry *);
extern int vfs_rename(struct inode *, struct dentry *, struct inode *, struct dentry *);

/*
 * This is the "filldir" function type, used by readdir() to let
 * the kernel specify what kind of dirent layout it wants to have.
 * This allows the kernel to read directories into kernel space or
 * to have different dirent layouts depending on the binary type.
 */
typedef int (*filldir_t)(void *, const char *, int, off_t, ino_t);
	
struct file_operations {
	loff_t (*llseek) (struct file *, loff_t, int);
	ssize_t (*read) (struct file *, char *, size_t, loff_t *);
	ssize_t (*write) (struct file *, const char *, size_t, loff_t *);
	int (*readdir) (struct file *, void *, filldir_t);
	unsigned int (*poll) (struct file *, struct poll_table_struct *);
	int (*ioctl) (struct inode *, struct file *, unsigned int, unsigned long);
	int (*mmap) (struct file *, struct vm_area_struct *);
	int (*open) (struct inode *, struct file *);
	int (*flush) (struct file *);
	int (*release) (struct inode *, struct file *);
	int (*fsync) (struct file *, struct dentry *);
	int (*fasync) (int, struct file *, int);
	int (*check_media_change) (kdev_t dev);
	int (*revalidate) (kdev_t dev);
	int (*lock) (struct file *, int, struct file_lock *);
};

struct inode_operations {
	struct file_operations * default_file_ops;
	int (*create) (struct inode *,struct dentry *,int);
	struct dentry * (*lookup) (struct inode *,struct dentry *);
	int (*link) (struct dentry *,struct inode *,struct dentry *);
	int (*unlink) (struct inode *,struct dentry *);
	int (*symlink) (struct inode *,struct dentry *,const char *);
	int (*mkdir) (struct inode *,struct dentry *,int);
	int (*rmdir) (struct inode *,struct dentry *);
	int (*mknod) (struct inode *,struct dentry *,int,int);
	int (*rename) (struct inode *, struct dentry *,
			struct inode *, struct dentry *);
	int (*readlink) (struct dentry *, char *,int);
	struct dentry * (*follow_link) (struct dentry *, struct dentry *, unsigned int);
	int (*readpage) (struct file *, struct page *);
	int (*writepage) (struct file *, struct page *);
	int (*bmap) (struct inode *,int);
	void (*truncate) (struct inode *);
	int (*permission) (struct inode *, int);
	int (*smap) (struct inode *,int);
	int (*updatepage) (struct file *, struct page *, unsigned long, unsigned int, int);
	int (*revalidate) (struct dentry *);
};

struct super_operations {
	void (*read_inode) (struct inode *);
	void (*write_inode) (struct inode *);
	void (*put_inode) (struct inode *);
	void (*delete_inode) (struct inode *);
	int (*notify_change) (struct dentry *, struct iattr *);
	void (*put_super) (struct super_block *);
	void (*write_super) (struct super_block *);
	int (*statfs) (struct super_block *, struct statfs *, int);
	int (*remount_fs) (struct super_block *, int *, char *);
	void (*clear_inode) (struct inode *);
	void (*umount_begin) (struct super_block *);
};

struct dquot_operations {
	void (*initialize) (struct inode *, short);
	void (*drop) (struct inode *);
	int (*alloc_block) (const struct inode *, unsigned long, uid_t, char);
	int (*alloc_inode) (const struct inode *, unsigned long, uid_t);
	void (*free_block) (const struct inode *, unsigned long);
	void (*free_inode) (const struct inode *, unsigned long);
	int (*transfer) (struct dentry *, struct iattr *, uid_t);
};

struct file_system_type {
	const char *name;
	int fs_flags;
	struct super_block *(*read_super) (struct super_block *, void *, int);
	struct file_system_type * next;
};

extern int register_filesystem(struct file_system_type *);
extern int unregister_filesystem(struct file_system_type *);

/* Return value for VFS lock functions - tells locks.c to lock conventionally
 * REALLY kosha for root NFS and nfs_lock
 */ 
#define LOCK_USE_CLNT 1

#define FLOCK_VERIFY_READ  1
#define FLOCK_VERIFY_WRITE 2

extern int locks_mandatory_locked(struct inode *inode);
extern int locks_mandatory_area(int read_write, struct inode *inode,
				struct file *filp, loff_t offset,
				size_t count);

extern inline int locks_verify_locked(struct inode *inode)
{
	/* Candidates for mandatory locking have the setgid bit set
	 * but no group execute bit -  an otherwise meaningless combination.
	 */
	if (IS_MANDLOCK(inode) &&
	    (inode->i_mode & (S_ISGID | S_IXGRP)) == S_ISGID)
		return (locks_mandatory_locked(inode));
	return (0);
}

extern inline int locks_verify_area(int read_write, struct inode *inode,
				    struct file *filp, loff_t offset,
				    size_t count)
{
	/* Candidates for mandatory locking have the setgid bit set
	 * but no group execute bit -  an otherwise meaningless combination.
	 */
	if (IS_MANDLOCK(inode) &&
	    (inode->i_mode & (S_ISGID | S_IXGRP)) == S_ISGID)
		return (locks_mandatory_area(read_write, inode, filp, offset,
					     count));
	return (0);
}


/* fs/open.c */

asmlinkage int sys_open(const char *, int, int);
asmlinkage int sys_close(unsigned int);		/* yes, it's really unsigned */
extern int do_truncate(struct dentry *, unsigned long);
extern int get_unused_fd(void);
extern void put_unused_fd(unsigned int);

extern struct file *filp_open(const char *, int, int);
extern int filp_close(struct file *, fl_owner_t id);

extern char * getname(const char * filename);
#define __getname()	((char *) __get_free_page(GFP_KERNEL))
#define putname(name)	free_page((unsigned long)(name))

extern void kill_fasync(struct fasync_struct *fa, int sig);
extern int register_blkdev(unsigned int, const char *, struct file_operations *);
extern int unregister_blkdev(unsigned int major, const char * name);
extern int blkdev_open(struct inode * inode, struct file * filp);
extern int blkdev_release (struct inode * inode);
extern struct file_operations def_blk_fops;
extern struct inode_operations blkdev_inode_operations;

/* fs/devices.c */
extern int register_chrdev(unsigned int, const char *, struct file_operations *);
extern int unregister_chrdev(unsigned int major, const char * name);
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 char * bdevname(kdev_t dev);
extern char * cdevname(kdev_t dev);
extern char * kdevname(kdev_t dev);


extern void init_fifo(struct inode * inode);
extern struct inode_operations fifo_inode_operations;

/* Invalid inode operations -- fs/bad_inode.c */
extern void make_bad_inode(struct inode * inode);
extern int is_bad_inode(struct inode * inode);

extern struct file_operations connecting_fifo_fops;
extern struct file_operations read_fifo_fops;
extern struct file_operations write_fifo_fops;
extern struct file_operations rdwr_fifo_fops;
extern struct file_operations read_pipe_fops;
extern struct file_operations write_pipe_fops;
extern struct file_operations rdwr_pipe_fops;

extern struct file_system_type *get_fs_type(const char *name);

extern int fs_may_remount_ro(struct super_block *);
extern int fs_may_mount(kdev_t dev);

extern struct file *inuse_filps;

extern void refile_buffer(struct buffer_head * buf);
extern void set_writetime(struct buffer_head * buf, int flag);
extern int try_to_free_buffers(struct page *);

extern int nr_buffers;
extern long buffermem;
extern int nr_buffer_heads;

#define BUF_CLEAN	0
#define BUF_LOCKED	1	/* Buffers scheduled for write */
#define BUF_DIRTY	2	/* Dirty buffers, not yet scheduled for write */
#define NR_LIST		3

void mark_buffer_uptodate(struct buffer_head * bh, int on);

extern inline void mark_buffer_clean(struct buffer_head * bh)
{
	if (test_and_clear_bit(BH_Dirty, &bh->b_state)) {
		if (bh->b_list == BUF_DIRTY)
			refile_buffer(bh);
	}
}

extern inline void mark_buffer_dirty(struct buffer_head * bh, int flag)
{
	if (!test_and_set_bit(BH_Dirty, &bh->b_state)) {
		set_writetime(bh, flag);
		if (bh->b_list != BUF_DIRTY)
			refile_buffer(bh);
	}
}

extern int check_disk_change(kdev_t dev);
extern int invalidate_inodes(struct super_block * sb);
extern void invalidate_inode_pages(struct inode *);
#define invalidate_buffers(dev)	__invalidate_buffers((dev), 0)
#define destroy_buffers(dev)	__invalidate_buffers((dev), 1)
extern void __invalidate_buffers(kdev_t dev, int);
extern int floppy_is_wp(int minor);
extern void sync_inodes(kdev_t dev);
extern void write_inode_now(struct inode *inode);
extern void sync_dev(kdev_t dev);
extern int fsync_dev(kdev_t dev);
extern void sync_supers(kdev_t dev);
extern int bmap(struct inode * inode,int block);
extern int notify_change(struct dentry *, struct iattr *);
extern int permission(struct inode * inode,int mask);
extern int get_write_access(struct inode *inode);
extern void put_write_access(struct inode *inode);
extern struct dentry * open_namei(const char * pathname, int flag, int mode);
extern struct dentry * do_mknod(const char * filename, int mode, dev_t dev);
extern int do_pipe(int *);

/* fs/dcache.c -- generic fs support functions */
extern int is_subdir(struct dentry *, struct dentry *);
extern ino_t find_inode_number(struct dentry *, struct qstr *);

/*
 * Kernel pointers have redundant information, so we can use a
 * scheme where we can return either an error code or a dentry
 * pointer with the same return value.
 *
 * This should be a per-architecture thing, to allow different
 * error and pointer decisions.
 */
#define ERR_PTR(err)	((void *)((long)(err)))
#define PTR_ERR(ptr)	((long)(ptr))
#define IS_ERR(ptr)	((unsigned long)(ptr) > (unsigned long)(-1000))

/*
 * The bitmask for a lookup event:
 *  - follow links at the end
 *  - require a directory
 *  - ending slashes ok even for nonexistent files
 *  - internal "there are more path compnents" flag
 */
#define LOOKUP_FOLLOW		(1)
#define LOOKUP_DIRECTORY	(2)
#define LOOKUP_SLASHOK		(4)
#define LOOKUP_CONTINUE		(8)

extern struct dentry * lookup_dentry(const char *, struct dentry *, unsigned int);
extern struct dentry * __namei(const char *, unsigned int);

#define namei(pathname)		__namei(pathname, 1)
#define lnamei(pathname)	__namei(pathname, 0)

extern void iput(struct inode *);
extern struct inode * igrab(struct inode *inode);
extern ino_t iunique(struct super_block *, ino_t);
extern struct inode * iget(struct super_block *, unsigned long);
extern struct inode * iget_in_use (struct super_block *, unsigned long);
extern void clear_inode(struct inode *);
extern struct inode * get_empty_inode(void);

extern void insert_inode_hash(struct inode *);
extern void remove_inode_hash(struct inode *);
extern struct file * get_empty_filp(void);
extern struct buffer_head * get_hash_table(kdev_t, int, int);
extern struct buffer_head * getblk(kdev_t, int, int);
extern struct buffer_head * find_buffer(kdev_t dev, int block, int size);
extern void ll_rw_block(int, int, struct buffer_head * bh[]);
extern int is_read_only(kdev_t);
extern void __brelse(struct buffer_head *);
extern inline void brelse(struct buffer_head *buf)
{
	if (buf)
		__brelse(buf);
}
extern void __bforget(struct buffer_head *buf);
extern inline void bforget(struct buffer_head *buf)
{
	if (buf)
		__bforget(buf);
}
extern void set_blocksize(kdev_t dev, int size);
extern unsigned int get_hardblocksize(kdev_t dev);
extern struct buffer_head * bread(kdev_t dev, int block, int size);
extern struct buffer_head * breada(kdev_t dev,int block, int size, 
				   unsigned int pos, unsigned int filesize);

extern int brw_page(int, struct page *, kdev_t, int [], int, int);

extern int generic_readpage(struct file *, struct page *);
extern int generic_file_mmap(struct file *, struct vm_area_struct *);
extern ssize_t generic_file_read(struct file *, char *, size_t, loff_t *);
extern ssize_t generic_file_write(struct file *, const char*, size_t, loff_t*);

extern struct super_block *get_super(kdev_t dev);
extern void put_super(kdev_t dev);
unsigned long generate_cluster(kdev_t dev, int b[], int size);
unsigned long generate_cluster_swab32(kdev_t dev, int b[], int size);
extern kdev_t ROOT_DEV;

extern void show_buffers(void);
extern void mount_root(void);

#ifdef CONFIG_BLK_DEV_INITRD
extern kdev_t real_root_dev;
extern int change_root(kdev_t new_root_dev,const char *put_old);
#endif

extern ssize_t char_read(struct file *, char *, size_t, loff_t *);
extern ssize_t block_read(struct file *, char *, size_t, loff_t *);
extern int read_ahead[];

extern ssize_t char_write(struct file *, const char *, size_t, loff_t *);
extern ssize_t block_write(struct file *, const char *, size_t, loff_t *);

extern int block_fsync(struct file *, struct dentry *dir);
extern int file_fsync(struct file *, struct dentry *dir);

extern int inode_change_ok(struct inode *, struct iattr *);
extern void inode_setattr(struct inode *, struct iattr *);

extern __u32 inode_generation_count;

#endif /* __KERNEL__ */

#endif