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 task_struct; 20 struct vfsmount; 21 struct dentry; 22 struct inode; 23 struct path; 24 extern struct file *alloc_file_pseudo(struct inode *, struct vfsmount *, 25 const char *, int flags, const struct file_operations *); 26 extern struct file *alloc_file_clone(struct file *, int flags, 27 const struct file_operations *); 28 29 static inline void fput_light(struct file *file, int fput_needed) 30 { 31 if (fput_needed) 32 fput(file); 33 } 34 35 struct fd { 36 struct file *file; 37 unsigned int flags; 38 }; 39 #define FDPUT_FPUT 1 40 #define FDPUT_POS_UNLOCK 2 41 42 static inline void fdput(struct fd fd) 43 { 44 if (fd.flags & FDPUT_FPUT) 45 fput(fd.file); 46 } 47 48 extern struct file *fget(unsigned int fd); 49 extern struct file *fget_many(unsigned int fd, unsigned int refs); 50 extern struct file *fget_raw(unsigned int fd); 51 extern struct file *fget_task(struct task_struct *task, unsigned int fd); 52 extern unsigned long __fdget(unsigned int fd); 53 extern unsigned long __fdget_raw(unsigned int fd); 54 extern unsigned long __fdget_pos(unsigned int fd); 55 extern void __f_unlock_pos(struct file *); 56 57 static inline struct fd __to_fd(unsigned long v) 58 { 59 return (struct fd){(struct file *)(v & ~3),v & 3}; 60 } 61 62 static inline struct fd fdget(unsigned int fd) 63 { 64 return __to_fd(__fdget(fd)); 65 } 66 67 static inline struct fd fdget_raw(unsigned int fd) 68 { 69 return __to_fd(__fdget_raw(fd)); 70 } 71 72 static inline struct fd fdget_pos(int fd) 73 { 74 return __to_fd(__fdget_pos(fd)); 75 } 76 77 static inline void fdput_pos(struct fd f) 78 { 79 if (f.flags & FDPUT_POS_UNLOCK) 80 __f_unlock_pos(f.file); 81 fdput(f); 82 } 83 84 extern int f_dupfd(unsigned int from, struct file *file, unsigned flags); 85 extern int replace_fd(unsigned fd, struct file *file, unsigned flags); 86 extern void set_close_on_exec(unsigned int fd, int flag); 87 extern bool get_close_on_exec(unsigned int fd); 88 extern int get_unused_fd_flags(unsigned flags); 89 extern void put_unused_fd(unsigned int fd); 90 91 extern void fd_install(unsigned int fd, struct file *file); 92 93 extern void flush_delayed_fput(void); 94 extern void __fput_sync(struct file *); 95 96 #endif /* __LINUX_FILE_H */ 97