remap_verify_area
EXPORT_SYMBOL_GPL(remap_verify_area);
ret = remap_verify_area(file_in, pos_in, len, false);
ret = remap_verify_area(file_out, pos_out, len, true);
ret = remap_verify_area(src_file, src_pos, len, false);
ret = remap_verify_area(dst_file, dst_pos, len, true);
ret = remap_verify_area(file, off, len, false);
ret = remap_verify_area(fxr->file1, fxr->file1_offset, check_len, true);
ret = remap_verify_area(fxr->file2, fxr->file2_offset, check_len, true);
int remap_verify_area(struct file *file, loff_t pos, loff_t len, bool write);