static inline unsigned long move_vma(struct vm_area_struct * vma, unsigned long addr, unsigned long old_len, unsigned long new_len) { struct vm_area_struct * new_vma; new_vma = kmem_cache_alloc(vm_area_cachep, SLAB_KERNEL); if (new_vma) { unsigned long new_addr = get_unmapped_area(addr, new_len); if (new_addr && !move_page_tables(current->mm, new_addr, addr, old_len)) { *new_vma = *vma; new_vma->vm_start = new_addr; new_vma->vm_end = new_addr+new_len; new_vma->vm_offset = vma->vm_offset + (addr - vma->vm_start); if (new_vma->vm_file) new_vma->vm_file->f_count++; if (new_vma->vm_ops && new_vma->vm_ops->open) new_vma->vm_ops->open(new_vma); insert_vm_struct(current->mm, new_vma); merge_segments(current->mm, new_vma->vm_start, new_vma->vm_end); do_munmap(addr, old_len); current->mm->total_vm += new_len >> PAGE_SHIFT; if (new_vma->vm_flags & VM_LOCKED) { current->mm->locked_vm += new_len >> PAGE_SHIFT; make_pages_present(new_vma->vm_start, new_vma->vm_end); } return new_addr; }
static inline unsigned long move_vma(struct vm_area_struct * vma, unsigned long addr, unsigned long old_len, unsigned long new_len, unsigned long new_addr) { struct mm_struct * mm = vma->vm_mm; struct vm_area_struct * new_vma, * next, * prev; int allocated_vma; new_vma = NULL; next = find_vma_prev(mm, new_addr, &prev); if (next) { if (prev && prev->vm_end == new_addr && can_vma_merge(prev, vma->vm_flags) && !vma->vm_file && !(vma->vm_flags & VM_SHARED)) { spin_lock(&mm->page_table_lock); prev->vm_end = new_addr + new_len; spin_unlock(&mm->page_table_lock); new_vma = prev; if (next != prev->vm_next) BUG(); if (prev->vm_end == next->vm_start && can_vma_merge(next, prev->vm_flags)) { spin_lock(&mm->page_table_lock); prev->vm_end = next->vm_end; __vma_unlink(mm, next, prev); spin_unlock(&mm->page_table_lock); mm->map_count--; kmem_cache_free(vm_area_cachep, next); } } else if (next->vm_start == new_addr + new_len && can_vma_merge(next, vma->vm_flags) && !vma->vm_file && !(vma->vm_flags & VM_SHARED)) { spin_lock(&mm->page_table_lock); next->vm_start = new_addr; spin_unlock(&mm->page_table_lock); new_vma = next; } } else { prev = find_vma(mm, new_addr-1); if (prev && prev->vm_end == new_addr && can_vma_merge(prev, vma->vm_flags) && !vma->vm_file && !(vma->vm_flags & VM_SHARED)) { spin_lock(&mm->page_table_lock); prev->vm_end = new_addr + new_len; spin_unlock(&mm->page_table_lock); new_vma = prev; } } allocated_vma = 0; if (!new_vma) { new_vma = kmem_cache_alloc(vm_area_cachep, SLAB_KERNEL); if (!new_vma) goto out; allocated_vma = 1; } if (!move_page_tables(current->mm, new_addr, addr, old_len)) { unsigned long vm_locked = vma->vm_flags & VM_LOCKED; if (allocated_vma) { *new_vma = *vma; new_vma->vm_start = new_addr; new_vma->vm_end = new_addr+new_len; new_vma->vm_pgoff += (addr-vma->vm_start) >> PAGE_SHIFT; new_vma->vm_raend = 0; if (new_vma->vm_file) get_file(new_vma->vm_file); if (new_vma->vm_ops && new_vma->vm_ops->open) new_vma->vm_ops->open(new_vma); insert_vm_struct(current->mm, new_vma); } /* XXX: possible errors masked, mapping might remain */ do_munmap(current->mm, addr, old_len); current->mm->total_vm += new_len >> PAGE_SHIFT; if (vm_locked) { current->mm->locked_vm += new_len >> PAGE_SHIFT; if (new_len > old_len) make_pages_present(new_addr + old_len, new_addr + new_len); } return new_addr; }