root/include/linux/file.h

INCLUDED FROM

DEFINITIONS

1. fput_light
2. fdput
3. __to_fd
4. fdget
5. fdget_raw
6. fdget_pos
7. fdput_pos

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 /*
   3  * Wrapper functions for accessing the file_struct fd array.
   4  */
   5 
   6 #ifndef __LINUX_FILE_H
   7 #define __LINUX_FILE_H
   8 
   9 #include <linux/compiler.h>
  10 #include <linux/types.h>
  11 #include <linux/posix_types.h>
  12 
  13 struct file;
  14 
  15 extern void fput(struct file *);
  16 extern void fput_many(struct file *, unsigned int);
  17 
  18 struct file_operations;
  19 struct vfsmount;
  20 struct dentry;
  21 struct inode;
  22 struct path;
  23 extern struct file *alloc_file_pseudo(struct inode *, struct vfsmount *,
  24         const char *, int flags, const struct file_operations *);
  25 extern struct file *alloc_file_clone(struct file *, int flags,
  26         const struct file_operations *);
  27 
  28 static inline void fput_light(struct file *file, int fput_needed)
  29 {
  30         if (fput_needed)
  31                 fput(file);
  32 }
  33 
  34 struct fd {
  35         struct file *file;
  36         unsigned int flags;
  37 };
  38 #define FDPUT_FPUT       1
  39 #define FDPUT_POS_UNLOCK 2
  40 
  41 static inline void fdput(struct fd fd)
  42 {
  43         if (fd.flags & FDPUT_FPUT)
  44                 fput(fd.file);
  45 }
  46 
  47 extern struct file *fget(unsigned int fd);
  48 extern struct file *fget_many(unsigned int fd, unsigned int refs);
  49 extern struct file *fget_raw(unsigned int fd);
  50 extern unsigned long __fdget(unsigned int fd);
  51 extern unsigned long __fdget_raw(unsigned int fd);
  52 extern unsigned long __fdget_pos(unsigned int fd);
  53 extern void __f_unlock_pos(struct file *);
  54 
  55 static inline struct fd __to_fd(unsigned long v)
  56 {
  57         return (struct fd){(struct file *)(v & ~3),v & 3};
  58 }
  59 
  60 static inline struct fd fdget(unsigned int fd)
  61 {
  62         return __to_fd(__fdget(fd));
  63 }
  64 
  65 static inline struct fd fdget_raw(unsigned int fd)
  66 {
  67         return __to_fd(__fdget_raw(fd));
  68 }
  69 
  70 static inline struct fd fdget_pos(int fd)
  71 {
  72         return __to_fd(__fdget_pos(fd));
  73 }
  74 
  75 static inline void fdput_pos(struct fd f)
  76 {
  77         if (f.flags & FDPUT_POS_UNLOCK)
  78                 __f_unlock_pos(f.file);
  79         fdput(f);
  80 }
  81 
  82 extern int f_dupfd(unsigned int from, struct file *file, unsigned flags);
  83 extern int replace_fd(unsigned fd, struct file *file, unsigned flags);
  84 extern void set_close_on_exec(unsigned int fd, int flag);
  85 extern bool get_close_on_exec(unsigned int fd);
  86 extern int get_unused_fd_flags(unsigned flags);
  87 extern void put_unused_fd(unsigned int fd);
  88 
  89 extern void fd_install(unsigned int fd, struct file *file);
  90 
  91 extern void flush_delayed_fput(void);
  92 extern void __fput_sync(struct file *);
  93 
  94 #endif /* __LINUX_FILE_H */