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