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/*
 * Wrapper functions for accessing the file_struct fd array.
 */
 
#ifndef __LINUX_FILE_H
#define __LINUX_FILE_H
 
#include <asm/atomic.h>
#include <linux/posix_types.h>
#include <linux/compiler.h>
#include <linux/spinlock.h>
#include <linux/rcupdate.h>
#include <linux/types.h>
 
/*
 * The default fd array needs to be at least BITS_PER_LONG,
 * as this is the granularity returned by copy_fdset().
 */
#define NR_OPEN_DEFAULT BITS_PER_LONG
 
/*
 * The embedded_fd_set is a small fd_set,
 * suitable for most tasks (which open <= BITS_PER_LONG files)
 */
struct embedded_fd_set {
	unsigned long fds_bits[1];
};
 
struct fdtable {
	unsigned int max_fds;
	struct file ** fd;      /* current fd array */
	fd_set *close_on_exec;
	fd_set *open_fds;
	struct rcu_head rcu;
	struct fdtable *next;
};
 
/*
 * Open file table structure
 */
struct files_struct {
  /*
   * read mostly part
   */
	atomic_t count;
	struct fdtable *fdt;
	struct fdtable fdtab;
  /*
   * written part on a separate cache line in SMP
   */
	spinlock_t file_lock ____cacheline_aligned_in_smp;
	int next_fd;
	struct embedded_fd_set close_on_exec_init;
	struct embedded_fd_set open_fds_init;
	struct file * fd_array[NR_OPEN_DEFAULT];
};
 
#define files_fdtable(files) (rcu_dereference((files)->fdt))
 
extern struct kmem_cache *filp_cachep;
 
extern void FASTCALL(__fput(struct file *));
extern void FASTCALL(fput(struct file *));
 
struct file_operations;
struct vfsmount;
struct dentry;
extern int init_file(struct file *, struct vfsmount *mnt,
		struct dentry *dentry, mode_t mode,
		const struct file_operations *fop);
extern struct file *alloc_file(struct vfsmount *, struct dentry *dentry,
		mode_t mode, const struct file_operations *fop);
 
static inline void fput_light(struct file *file, int fput_needed)
{
	if (unlikely(fput_needed))
		fput(file);
}
 
extern struct file * FASTCALL(fget(unsigned int fd));
extern struct file * FASTCALL(fget_light(unsigned int fd, int *fput_needed));
extern void FASTCALL(set_close_on_exec(unsigned int fd, int flag));
extern void put_filp(struct file *);
extern int get_unused_fd(void);
extern int get_unused_fd_flags(int flags);
extern void FASTCALL(put_unused_fd(unsigned int fd));
struct kmem_cache;
 
extern int expand_files(struct files_struct *, int nr);
extern void free_fdtable_rcu(struct rcu_head *rcu);
extern void __init files_defer_init(void);
 
static inline void free_fdtable(struct fdtable *fdt)
{
	call_rcu(&fdt->rcu, free_fdtable_rcu);
}
 
static inline struct file * fcheck_files(struct files_struct *files, unsigned int fd)
{
	struct file * file = NULL;
	struct fdtable *fdt = files_fdtable(files);
 
	if (fd < fdt->max_fds)
		file = rcu_dereference(fdt->fd[fd]);
	return file;
}
 
/*
 * Check whether the specified fd has an open file.
 */
#define fcheck(fd)	fcheck_files(current->files, fd)
 
extern void FASTCALL(fd_install(unsigned int fd, struct file * file));
 
struct task_struct;
 
struct files_struct *get_files_struct(struct task_struct *);
void FASTCALL(put_files_struct(struct files_struct *fs));
void reset_files_struct(struct task_struct *, struct files_struct *);
 
extern struct kmem_cache *files_cachep;
 
#endif /* __LINUX_FILE_H */