605 static void bpf_map_mmap_open(struct vm_area_struct *vma)  in bpf_map_mmap_open()  argument
607 	struct bpf_map *map = vma->vm_file->private_data;  in bpf_map_mmap_open()
609 	if (vma->vm_flags & VM_MAYWRITE)  in bpf_map_mmap_open()
614 static void bpf_map_mmap_close(struct vm_area_struct *vma)  in bpf_map_mmap_close()  argument
616 	struct bpf_map *map = vma->vm_file->private_data;  in bpf_map_mmap_close()
618 	if (vma->vm_flags & VM_MAYWRITE)  in bpf_map_mmap_close()
627 static int bpf_map_mmap(struct file *filp, struct vm_area_struct *vma)  in bpf_map_mmap()  argument
635 	if (!(vma->vm_flags & VM_SHARED))  in bpf_map_mmap()
640 	if (vma->vm_flags & VM_WRITE) {  in bpf_map_mmap()
657 	vma->vm_ops = &bpf_map_default_vmops;  in bpf_map_mmap()
658 	vma->vm_private_data = map;  in bpf_map_mmap()
659 	vma->vm_flags &= ~VM_MAYEXEC;  in bpf_map_mmap()
660 	if (!(vma->vm_flags & VM_WRITE))  in bpf_map_mmap()
662 		vma->vm_flags &= ~VM_MAYWRITE;  in bpf_map_mmap()
664 	err = map->ops->map_mmap(map, vma);  in bpf_map_mmap()
668 	if (vma->vm_flags & VM_MAYWRITE)  in bpf_map_mmap()