667 	struct nullb_page *t_page;  in null_alloc_page()  local
669 	t_page = kmalloc(sizeof(struct nullb_page), gfp_flags);  in null_alloc_page()
670 	if (!t_page)  in null_alloc_page()
673 	t_page->page = alloc_pages(gfp_flags, 0);  in null_alloc_page()
674 	if (!t_page->page)  in null_alloc_page()
677 	memset(t_page->bitmap, 0, sizeof(t_page->bitmap));  in null_alloc_page()
678 	return t_page;  in null_alloc_page()
680 	kfree(t_page);  in null_alloc_page()
685 static void null_free_page(struct nullb_page *t_page)  in null_free_page()  argument
687 	__set_bit(NULLB_PAGE_FREE, t_page->bitmap);  in null_free_page()
688 	if (test_bit(NULLB_PAGE_LOCK, t_page->bitmap))  in null_free_page()
690 	__free_page(t_page->page);  in null_free_page()
691 	kfree(t_page);  in null_free_page()
706 	struct nullb_page *t_page, *ret;  in null_free_sector()  local
713 	t_page = radix_tree_lookup(root, idx);  in null_free_sector()
714 	if (t_page) {  in null_free_sector()
715 		__clear_bit(sector_bit, t_page->bitmap);  in null_free_sector()
717 		if (null_page_empty(t_page)) {  in null_free_sector()
718 			ret = radix_tree_delete_item(root, idx, t_page);  in null_free_sector()
719 			WARN_ON(ret != t_page);  in null_free_sector()
728 	struct nullb_page *t_page, bool is_cache)  in null_radix_tree_insert()  argument
734 	if (radix_tree_insert(root, idx, t_page)) {  in null_radix_tree_insert()
735 		null_free_page(t_page);  in null_radix_tree_insert()
736 		t_page = radix_tree_lookup(root, idx);  in null_radix_tree_insert()
737 		WARN_ON(!t_page || t_page->page->index != idx);  in null_radix_tree_insert()
741 	return t_page;  in null_radix_tree_insert()
778 	struct nullb_page *t_page;  in __null_lookup_page()  local
785 	t_page = radix_tree_lookup(root, idx);  in __null_lookup_page()
786 	WARN_ON(t_page && t_page->page->index != idx);  in __null_lookup_page()
788 	if (t_page && (for_write || test_bit(sector_bit, t_page->bitmap)))  in __null_lookup_page()
789 		return t_page;  in __null_lookup_page()
812 	struct nullb_page *t_page;  in null_insert_page()  local
814 	t_page = null_lookup_page(nullb, sector, true, ignore_cache);  in null_insert_page()
815 	if (t_page)  in null_insert_page()
816 		return t_page;  in null_insert_page()
820 	t_page = null_alloc_page(GFP_NOIO);  in null_insert_page()
821 	if (!t_page)  in null_insert_page()
829 	t_page->page->index = idx;  in null_insert_page()
830 	t_page = null_radix_tree_insert(nullb, idx, t_page, !ignore_cache);  in null_insert_page()
833 	return t_page;  in null_insert_page()
835 	null_free_page(t_page);  in null_insert_page()
846 	struct nullb_page *t_page, *ret;  in null_flush_cache_page()  local
851 	t_page = null_insert_page(nullb, idx << PAGE_SECTORS_SHIFT, true);  in null_flush_cache_page()
856 		if (t_page && null_page_empty(t_page)) {  in null_flush_cache_page()
858 				idx, t_page);  in null_flush_cache_page()
859 			null_free_page(t_page);  in null_flush_cache_page()
864 	if (!t_page)  in null_flush_cache_page()
868 	dst = kmap_atomic(t_page->page);  in null_flush_cache_page()
876 			__set_bit(i, t_page->bitmap);  in null_flush_cache_page()
948 	struct nullb_page *t_page;  in copy_to_nullb()  local
958 		t_page = null_insert_page(nullb, sector,  in copy_to_nullb()
960 		if (!t_page)  in copy_to_nullb()
964 		dst = kmap_atomic(t_page->page);  in copy_to_nullb()
969 		__set_bit(sector & SECTOR_MASK, t_page->bitmap);  in copy_to_nullb()
985 	struct nullb_page *t_page;  in copy_from_nullb()  local
992 		t_page = null_lookup_page(nullb, sector, false,  in copy_from_nullb()
996 		if (!t_page) {  in copy_from_nullb()
1000 		src = kmap_atomic(t_page->page);  in copy_from_nullb()