aboutsummaryrefslogblamecommitdiffstats
path: root/include/linux/fdtable.h
blob: 133c0ba25e306a68199d399cf26fc15c242d347a (plain) (tree)
1
2
3
4
5
6
7






                                                                        




                              
                       
                     

                       
















                                                              
                                                           













                              
                                  







                                                          
                                                      

  

                                                     

                                                                        

                                                                     


                                                                      
 


















                                                                                     
                                                                         













                                                            
                                                          



                                       
/*
 * descriptor table internals; you almost certainly want file.h instead.
 */

#ifndef __LINUX_FDTABLE_H
#define __LINUX_FDTABLE_H

#include <linux/posix_types.h>
#include <linux/compiler.h>
#include <linux/spinlock.h>
#include <linux/rcupdate.h>
#include <linux/types.h>
#include <linux/init.h>
#include <linux/fs.h>

#include <asm/atomic.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 __rcu **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 __rcu *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 __rcu * fd_array[NR_OPEN_DEFAULT];
};

#define rcu_dereference_check_fdtable(files, fdtfd) \
	(rcu_dereference_check((fdtfd), \
			       rcu_read_lock_held() || \
			       lockdep_is_held(&(files)->file_lock) || \
			       atomic_read(&(files)->count) == 1 || \
			       rcu_my_thread_group_empty()))

#define files_fdtable(files) \
		(rcu_dereference_check_fdtable((files), (files)->fdt))

struct file_operations;
struct vfsmount;
struct dentry;

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_check_fdtable(files, fdt->fd[fd]);
	return file;
}

/*
 * Check whether the specified fd has an open file.
 */
#define fcheck(fd)	fcheck_files(current->files, fd)

struct task_struct;

struct files_struct *get_files_struct(struct task_struct *);
void put_files_struct(struct files_struct *fs);
void reset_files_struct(struct files_struct *);
int unshare_files(struct files_struct **);
struct files_struct *dup_fd(struct files_struct *, int *);

extern struct kmem_cache *files_cachep;

#endif /* __LINUX_FDTABLE_H */