1/****************************************************************************
2 ****************************************************************************
3 ***
4 ***   This header was automatically generated from a Linux kernel header
5 ***   of the same name, to make information necessary for userspace to
6 ***   call into the kernel available to libc.  It contains only constants,
7 ***   structures, and macros generated from the original header, and thus,
8 ***   contains no copyrightable information.
9 ***
10 ****************************************************************************
11 ****************************************************************************/
12#ifndef __LINUX_FILE_H
13#define __LINUX_FILE_H
14
15#include <asm/atomic.h>
16#include <linux/posix_types.h>
17#include <linux/compiler.h>
18#include <linux/spinlock.h>
19#include <linux/rcupdate.h>
20#include <linux/types.h>
21
22#define NR_OPEN_DEFAULT BITS_PER_LONG
23
24struct embedded_fd_set {
25 unsigned long fds_bits[1];
26};
27
28#define EMBEDDED_FD_SET_SIZE (BITS_PER_BYTE * sizeof(struct embedded_fd_set))
29
30struct fdtable {
31 unsigned int max_fds;
32 int max_fdset;
33 struct file ** fd;
34 fd_set *close_on_exec;
35 fd_set *open_fds;
36 struct rcu_head rcu;
37 struct files_struct *free_files;
38 struct fdtable *next;
39};
40
41struct files_struct {
42
43 atomic_t count;
44 struct fdtable *fdt;
45 struct fdtable fdtab;
46
47 spinlock_t file_lock ____cacheline_aligned_in_smp;
48 int next_fd;
49 struct embedded_fd_set close_on_exec_init;
50 struct embedded_fd_set open_fds_init;
51 struct file * fd_array[NR_OPEN_DEFAULT];
52};
53
54#define files_fdtable(files) (rcu_dereference((files)->fdt))
55
56struct kmem_cache;
57
58#define fcheck(fd) fcheck_files(current->files, fd)
59
60struct task_struct;
61
62struct files_struct *get_files_struct(struct task_struct *);
63
64#endif
65