| /* SPDX-License-Identifier: GPL-2.0 */ |
| /* |
| * Wrapper functions for accessing the file_struct fd array. |
| */ |
| |
| #ifndef __LINUX_FILE_H |
| #define __LINUX_FILE_H |
| |
| #include <linux/compiler.h> |
| #include <linux/types.h> |
| #include <linux/posix_types.h> |
| #include <linux/errno.h> |
| |
| struct file; |
| |
| extern void fput(struct file *); |
| extern void fput_many(struct file *, unsigned int); |
| |
| struct file_operations; |
| struct task_struct; |
| struct vfsmount; |
| struct dentry; |
| struct inode; |
| struct path; |
| extern struct file *alloc_file_pseudo(struct inode *, struct vfsmount *, |
| const char *, int flags, const struct file_operations *); |
| extern struct file *alloc_file_clone(struct file *, int flags, |
| const struct file_operations *); |
| |
| static inline void fput_light(struct file *file, int fput_needed) |
| { |
| if (fput_needed) |
| fput(file); |
| } |
| |
| struct fd { |
| struct file *file; |
| unsigned int flags; |
| }; |
| #define FDPUT_FPUT 1 |
| #define FDPUT_POS_UNLOCK 2 |
| |
| static inline void fdput(struct fd fd) |
| { |
| if (fd.flags & FDPUT_FPUT) |
| fput(fd.file); |
| } |
| |
| extern struct file *fget(unsigned int fd); |
| extern struct file *fget_many(unsigned int fd, unsigned int refs); |
| extern struct file *fget_raw(unsigned int fd); |
| extern struct file *fget_task(struct task_struct *task, unsigned int fd); |
| extern unsigned long __fdget(unsigned int fd); |
| extern unsigned long __fdget_raw(unsigned int fd); |
| extern unsigned long __fdget_pos(unsigned int fd); |
| extern void __f_unlock_pos(struct file *); |
| |
| static inline struct fd __to_fd(unsigned long v) |
| { |
| return (struct fd){(struct file *)(v & ~3),v & 3}; |
| } |
| |
| static inline struct fd fdget(unsigned int fd) |
| { |
| return __to_fd(__fdget(fd)); |
| } |
| |
| static inline struct fd fdget_raw(unsigned int fd) |
| { |
| return __to_fd(__fdget_raw(fd)); |
| } |
| |
| static inline struct fd fdget_pos(int fd) |
| { |
| return __to_fd(__fdget_pos(fd)); |
| } |
| |
| static inline void fdput_pos(struct fd f) |
| { |
| if (f.flags & FDPUT_POS_UNLOCK) |
| __f_unlock_pos(f.file); |
| fdput(f); |
| } |
| |
| extern int f_dupfd(unsigned int from, struct file *file, unsigned flags); |
| extern int replace_fd(unsigned fd, struct file *file, unsigned flags); |
| extern void set_close_on_exec(unsigned int fd, int flag); |
| extern bool get_close_on_exec(unsigned int fd); |
| extern int __get_unused_fd_flags(unsigned flags, unsigned long nofile); |
| extern int get_unused_fd_flags(unsigned flags); |
| extern void put_unused_fd(unsigned int fd); |
| |
| extern void fd_install(unsigned int fd, struct file *file); |
| |
| extern int __receive_fd(int fd, struct file *file, int __user *ufd, |
| unsigned int o_flags); |
| static inline int receive_fd_user(struct file *file, int __user *ufd, |
| unsigned int o_flags) |
| { |
| if (ufd == NULL) |
| return -EFAULT; |
| return __receive_fd(-1, file, ufd, o_flags); |
| } |
| static inline int receive_fd(struct file *file, unsigned int o_flags) |
| { |
| return __receive_fd(-1, file, NULL, o_flags); |
| } |
| static inline int receive_fd_replace(int fd, struct file *file, unsigned int o_flags) |
| { |
| return __receive_fd(fd, file, NULL, o_flags); |
| } |
| |
| extern void flush_delayed_fput(void); |
| extern void __fput_sync(struct file *); |
| |
| extern unsigned int sysctl_nr_open_min, sysctl_nr_open_max; |
| |
| #endif /* __LINUX_FILE_H */ |