1 files changed, 118 insertions, 0 deletions
diff --git a/include/linux/file.h b/include/linux/file.h
new file mode 100644
index 000000000..6e9099d29
--- /dev/null
+++ b/include/linux/file.h
@@ -0,0 +1,118 @@
+/* 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>
+#include <linux/cleanup.h>
+
+struct file;
+
+extern void fput(struct file *);
+
+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_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);
+}
+
+DEFINE_CLASS(fd, struct fd, fdput(_T), fdget(fd), int fd)
+
+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);
+
+DEFINE_CLASS(get_unused_fd, int, if (_T >= 0) put_unused_fd(_T),
+	     get_unused_fd_flags(flags), unsigned flags)
+
+extern void fd_install(unsigned int fd, struct file *file);
+
+extern int __receive_fd(struct file *file, int __user *ufd,
+			unsigned int o_flags);
+
+extern int receive_fd(struct file *file, 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(file, ufd, o_flags);
+}
+int receive_fd_replace(int new_fd, struct file *file, unsigned int 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 */