734 	struct nullb_page *t_page;  in null_alloc_page()  local
736 	t_page = kmalloc(sizeof(struct nullb_page), gfp_flags);  in null_alloc_page()
737 	if (!t_page)  in null_alloc_page()
740 	t_page->page = alloc_pages(gfp_flags, 0);  in null_alloc_page()
741 	if (!t_page->page)  in null_alloc_page()
744 	memset(t_page->bitmap, 0, sizeof(t_page->bitmap));  in null_alloc_page()
745 	return t_page;  in null_alloc_page()
747 	kfree(t_page);  in null_alloc_page()
752 static void null_free_page(struct nullb_page *t_page)  in null_free_page()  argument
754 	__set_bit(NULLB_PAGE_FREE, t_page->bitmap);  in null_free_page()
755 	if (test_bit(NULLB_PAGE_LOCK, t_page->bitmap))  in null_free_page()
757 	__free_page(t_page->page);  in null_free_page()
758 	kfree(t_page);  in null_free_page()
773 	struct nullb_page *t_page, *ret;  in null_free_sector()  local
780 	t_page = radix_tree_lookup(root, idx);  in null_free_sector()
781 	if (t_page) {  in null_free_sector()
782 		__clear_bit(sector_bit, t_page->bitmap);  in null_free_sector()
784 		if (null_page_empty(t_page)) {  in null_free_sector()
785 			ret = radix_tree_delete_item(root, idx, t_page);  in null_free_sector()
786 			WARN_ON(ret != t_page);  in null_free_sector()
795 	struct nullb_page *t_page, bool is_cache)  in null_radix_tree_insert()  argument
801 	if (radix_tree_insert(root, idx, t_page)) {  in null_radix_tree_insert()
802 		null_free_page(t_page);  in null_radix_tree_insert()
803 		t_page = radix_tree_lookup(root, idx);  in null_radix_tree_insert()
804 		WARN_ON(!t_page || t_page->page->index != idx);  in null_radix_tree_insert()
808 	return t_page;  in null_radix_tree_insert()
845 	struct nullb_page *t_page;  in __null_lookup_page()  local
852 	t_page = radix_tree_lookup(root, idx);  in __null_lookup_page()
853 	WARN_ON(t_page && t_page->page->index != idx);  in __null_lookup_page()
855 	if (t_page && (for_write || test_bit(sector_bit, t_page->bitmap)))  in __null_lookup_page()
856 		return t_page;  in __null_lookup_page()
879 	struct nullb_page *t_page;  in null_insert_page()  local
881 	t_page = null_lookup_page(nullb, sector, true, ignore_cache);  in null_insert_page()
882 	if (t_page)  in null_insert_page()
883 		return t_page;  in null_insert_page()
887 	t_page = null_alloc_page(GFP_NOIO);  in null_insert_page()
888 	if (!t_page)  in null_insert_page()
896 	t_page->page->index = idx;  in null_insert_page()
897 	t_page = null_radix_tree_insert(nullb, idx, t_page, !ignore_cache);  in null_insert_page()
900 	return t_page;  in null_insert_page()
902 	null_free_page(t_page);  in null_insert_page()
913 	struct nullb_page *t_page, *ret;  in null_flush_cache_page()  local
918 	t_page = null_insert_page(nullb, idx << PAGE_SECTORS_SHIFT, true);  in null_flush_cache_page()
923 		if (t_page && null_page_empty(t_page)) {  in null_flush_cache_page()
925 				idx, t_page);  in null_flush_cache_page()
926 			null_free_page(t_page);  in null_flush_cache_page()
931 	if (!t_page)  in null_flush_cache_page()
935 	dst = kmap_atomic(t_page->page);  in null_flush_cache_page()
943 			__set_bit(i, t_page->bitmap);  in null_flush_cache_page()
1015 	struct nullb_page *t_page;  in copy_to_nullb()  local
1025 		t_page = null_insert_page(nullb, sector,  in copy_to_nullb()
1027 		if (!t_page)  in copy_to_nullb()
1031 		dst = kmap_atomic(t_page->page);  in copy_to_nullb()
1036 		__set_bit(sector & SECTOR_MASK, t_page->bitmap);  in copy_to_nullb()
1052 	struct nullb_page *t_page;  in copy_from_nullb()  local
1059 		t_page = null_lookup_page(nullb, sector, false,  in copy_from_nullb()
1063 		if (!t_page) {  in copy_from_nullb()
1067 		src = kmap_atomic(t_page->page);  in copy_from_nullb()