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 17 struct file_operations; 18 struct vfsmount; 19 struct dentry; 20 struct inode; 21 struct path; 22 extern struct file *alloc_file_pseudo(struct inode *, struct vfsmount *, 23 const char *, int flags, const struct file_operations *); 24 extern struct file *alloc_file_clone(struct file *, int flags, 25 const struct file_operations *); 26 27 static inline void fput_light(struct file *file, int fput_needed) 28 { 29 if (fput_needed) 30 fput(file); 31 } 32 33 struct fd { 34 struct file *file; 35 unsigned int flags; 36 }; 37 #define FDPUT_FPUT 1 38 #define FDPUT_POS_UNLOCK 2 39 40 static inline void fdput(struct fd fd) 41 { 42 if (fd.flags & FDPUT_FPUT) 43 fput(fd.file); 44 } 45 46 extern struct file *fget(unsigned int fd); 47 extern struct file *fget_raw(unsigned int fd); 48 extern unsigned long __fdget(unsigned int fd); 49 extern unsigned long __fdget_raw(unsigned int fd); 50 extern unsigned long __fdget_pos(unsigned int fd); 51 extern void __f_unlock_pos(struct file *); 52 53 static inline struct fd __to_fd(unsigned long v) 54 { 55 return (struct fd){(struct file *)(v & ~3),v & 3}; 56 } 57 58 static inline struct fd fdget(unsigned int fd) 59 { 60 return __to_fd(__fdget(fd)); 61 } 62 63 static inline struct fd fdget_raw(unsigned int fd) 64 { 65 return __to_fd(__fdget_raw(fd)); 66 } 67 68 static inline struct fd fdget_pos(int fd) 69 { 70 return __to_fd(__fdget_pos(fd)); 71 } 72 73 static inline void fdput_pos(struct fd f) 74 { 75 if (f.flags & FDPUT_POS_UNLOCK) 76 __f_unlock_pos(f.file); 77 fdput(f); 78 } 79 80 extern int f_dupfd(unsigned int from, struct file *file, unsigned flags); 81 extern int replace_fd(unsigned fd, struct file *file, unsigned flags); 82 extern void set_close_on_exec(unsigned int fd, int flag); 83 extern bool get_close_on_exec(unsigned int fd); 84 extern int get_unused_fd_flags(unsigned flags); 85 extern void put_unused_fd(unsigned int fd); 86 87 extern void fd_install(unsigned int fd, struct file *file); 88 89 extern void flush_delayed_fput(void); 90 extern void __fput_sync(struct file *); 91 92 #endif /* __LINUX_FILE_H */ 93