724 	struct nullb_page *t_page;  in null_alloc_page()  local
726 	t_page = kmalloc(sizeof(struct nullb_page), gfp_flags);  in null_alloc_page()
727 	if (!t_page)  in null_alloc_page()
730 	t_page->page = alloc_pages(gfp_flags, 0);  in null_alloc_page()
731 	if (!t_page->page)  in null_alloc_page()
734 	memset(t_page->bitmap, 0, sizeof(t_page->bitmap));  in null_alloc_page()
735 	return t_page;  in null_alloc_page()
737 	kfree(t_page);  in null_alloc_page()
742 static void null_free_page(struct nullb_page *t_page)  in null_free_page()  argument
744 	__set_bit(NULLB_PAGE_FREE, t_page->bitmap);  in null_free_page()
745 	if (test_bit(NULLB_PAGE_LOCK, t_page->bitmap))  in null_free_page()
747 	__free_page(t_page->page);  in null_free_page()
748 	kfree(t_page);  in null_free_page()
763 	struct nullb_page *t_page, *ret;  in null_free_sector()  local
770 	t_page = radix_tree_lookup(root, idx);  in null_free_sector()
771 	if (t_page) {  in null_free_sector()
772 		__clear_bit(sector_bit, t_page->bitmap);  in null_free_sector()
774 		if (null_page_empty(t_page)) {  in null_free_sector()
775 			ret = radix_tree_delete_item(root, idx, t_page);  in null_free_sector()
776 			WARN_ON(ret != t_page);  in null_free_sector()
785 	struct nullb_page *t_page, bool is_cache)  in null_radix_tree_insert()  argument
791 	if (radix_tree_insert(root, idx, t_page)) {  in null_radix_tree_insert()
792 		null_free_page(t_page);  in null_radix_tree_insert()
793 		t_page = radix_tree_lookup(root, idx);  in null_radix_tree_insert()
794 		WARN_ON(!t_page || t_page->page->index != idx);  in null_radix_tree_insert()
798 	return t_page;  in null_radix_tree_insert()
835 	struct nullb_page *t_page;  in __null_lookup_page()  local
842 	t_page = radix_tree_lookup(root, idx);  in __null_lookup_page()
843 	WARN_ON(t_page && t_page->page->index != idx);  in __null_lookup_page()
845 	if (t_page && (for_write || test_bit(sector_bit, t_page->bitmap)))  in __null_lookup_page()
846 		return t_page;  in __null_lookup_page()
869 	struct nullb_page *t_page;  in null_insert_page()  local
871 	t_page = null_lookup_page(nullb, sector, true, ignore_cache);  in null_insert_page()
872 	if (t_page)  in null_insert_page()
873 		return t_page;  in null_insert_page()
877 	t_page = null_alloc_page(GFP_NOIO);  in null_insert_page()
878 	if (!t_page)  in null_insert_page()
886 	t_page->page->index = idx;  in null_insert_page()
887 	t_page = null_radix_tree_insert(nullb, idx, t_page, !ignore_cache);  in null_insert_page()
890 	return t_page;  in null_insert_page()
892 	null_free_page(t_page);  in null_insert_page()
903 	struct nullb_page *t_page, *ret;  in null_flush_cache_page()  local
908 	t_page = null_insert_page(nullb, idx << PAGE_SECTORS_SHIFT, true);  in null_flush_cache_page()
913 		if (t_page && null_page_empty(t_page)) {  in null_flush_cache_page()
915 				idx, t_page);  in null_flush_cache_page()
916 			null_free_page(t_page);  in null_flush_cache_page()
921 	if (!t_page)  in null_flush_cache_page()
925 	dst = kmap_atomic(t_page->page);  in null_flush_cache_page()
933 			__set_bit(i, t_page->bitmap);  in null_flush_cache_page()
1005 	struct nullb_page *t_page;  in copy_to_nullb()  local
1015 		t_page = null_insert_page(nullb, sector,  in copy_to_nullb()
1017 		if (!t_page)  in copy_to_nullb()
1021 		dst = kmap_atomic(t_page->page);  in copy_to_nullb()
1026 		__set_bit(sector & SECTOR_MASK, t_page->bitmap);  in copy_to_nullb()
1042 	struct nullb_page *t_page;  in copy_from_nullb()  local
1049 		t_page = null_lookup_page(nullb, sector, false,  in copy_from_nullb()
1053 		if (!t_page) {  in copy_from_nullb()
1057 		src = kmap_atomic(t_page->page);  in copy_from_nullb()