函数逻辑报告

函数名称：generic_copy_file_range - copy data between two files*@file_in: file structure to read from*@pos_in: file offset to read from*@file_out: file structure to write data to*@pos_out: file offset to write data to*@len: amount of data to copy*@flags: copy flags

函数原型：ssize_t generic_copy_file_range(struct file *file_in, loff_t pos_in, struct file *file_out, loff_t pos_out, size_t len, unsigned int flags)

返回类型：ssize_t

参数：