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TOMOYO Linux Cross Reference
Linux/include/linux/file.h

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  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 #include <linux/errno.h>
 13 
 14 struct file;
 15 
 16 extern void fput(struct file *);
 17 extern void fput_many(struct file *, unsigned int);
 18 
 19 struct file_operations;
 20 struct task_struct;
 21 struct vfsmount;
 22 struct dentry;
 23 struct inode;
 24 struct path;
 25 extern struct file *alloc_file_pseudo(struct inode *, struct vfsmount *,
 26         const char *, int flags, const struct file_operations *);
 27 extern struct file *alloc_file_clone(struct file *, int flags,
 28         const struct file_operations *);
 29 
 30 static inline void fput_light(struct file *file, int fput_needed)
 31 {
 32         if (fput_needed)
 33                 fput(file);
 34 }
 35 
 36 struct fd {
 37         struct file *file;
 38         unsigned int flags;
 39 };
 40 #define FDPUT_FPUT       1
 41 #define FDPUT_POS_UNLOCK 2
 42 
 43 static inline void fdput(struct fd fd)
 44 {
 45         if (fd.flags & FDPUT_FPUT)
 46                 fput(fd.file);
 47 }
 48 
 49 extern struct file *fget(unsigned int fd);
 50 extern struct file *fget_many(unsigned int fd, unsigned int refs);
 51 extern struct file *fget_raw(unsigned int fd);
 52 extern struct file *fget_task(struct task_struct *task, unsigned int fd);
 53 extern unsigned long __fdget(unsigned int fd);
 54 extern unsigned long __fdget_raw(unsigned int fd);
 55 extern unsigned long __fdget_pos(unsigned int fd);
 56 extern void __f_unlock_pos(struct file *);
 57 
 58 static inline struct fd __to_fd(unsigned long v)
 59 {
 60         return (struct fd){(struct file *)(v & ~3),v & 3};
 61 }
 62 
 63 static inline struct fd fdget(unsigned int fd)
 64 {
 65         return __to_fd(__fdget(fd));
 66 }
 67 
 68 static inline struct fd fdget_raw(unsigned int fd)
 69 {
 70         return __to_fd(__fdget_raw(fd));
 71 }
 72 
 73 static inline struct fd fdget_pos(int fd)
 74 {
 75         return __to_fd(__fdget_pos(fd));
 76 }
 77 
 78 static inline void fdput_pos(struct fd f)
 79 {
 80         if (f.flags & FDPUT_POS_UNLOCK)
 81                 __f_unlock_pos(f.file);
 82         fdput(f);
 83 }
 84 
 85 extern int f_dupfd(unsigned int from, struct file *file, unsigned flags);
 86 extern int replace_fd(unsigned fd, struct file *file, unsigned flags);
 87 extern void set_close_on_exec(unsigned int fd, int flag);
 88 extern bool get_close_on_exec(unsigned int fd);
 89 extern int __get_unused_fd_flags(unsigned flags, unsigned long nofile);
 90 extern int get_unused_fd_flags(unsigned flags);
 91 extern void put_unused_fd(unsigned int fd);
 92 
 93 extern void fd_install(unsigned int fd, struct file *file);
 94 
 95 extern int __receive_fd(int fd, struct file *file, int __user *ufd,
 96                         unsigned int o_flags);
 97 static inline int receive_fd_user(struct file *file, int __user *ufd,
 98                                   unsigned int o_flags)
 99 {
100         if (ufd == NULL)
101                 return -EFAULT;
102         return __receive_fd(-1, file, ufd, o_flags);
103 }
104 static inline int receive_fd(struct file *file, unsigned int o_flags)
105 {
106         return __receive_fd(-1, file, NULL, o_flags);
107 }
108 static inline int receive_fd_replace(int fd, struct file *file, unsigned int o_flags)
109 {
110         return __receive_fd(fd, file, NULL, o_flags);
111 }
112 
113 extern void flush_delayed_fput(void);
114 extern void __fput_sync(struct file *);
115 
116 extern unsigned int sysctl_nr_open_min, sysctl_nr_open_max;
117 
118 #endif /* __LINUX_FILE_H */
119 

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