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