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 */ 95