654 	struct nullb_page *t_page;  in null_alloc_page()  local
656 	t_page = kmalloc(sizeof(struct nullb_page), gfp_flags);  in null_alloc_page()
657 	if (!t_page)  in null_alloc_page()
660 	t_page->page = alloc_pages(gfp_flags, 0);  in null_alloc_page()
661 	if (!t_page->page)  in null_alloc_page()
664 	memset(t_page->bitmap, 0, sizeof(t_page->bitmap));  in null_alloc_page()
665 	return t_page;  in null_alloc_page()
667 	kfree(t_page);  in null_alloc_page()
672 static void null_free_page(struct nullb_page *t_page)  in null_free_page()  argument
674 	__set_bit(NULLB_PAGE_FREE, t_page->bitmap);  in null_free_page()
675 	if (test_bit(NULLB_PAGE_LOCK, t_page->bitmap))  in null_free_page()
677 	__free_page(t_page->page);  in null_free_page()
678 	kfree(t_page);  in null_free_page()
693 	struct nullb_page *t_page, *ret;  in null_free_sector()  local
700 	t_page = radix_tree_lookup(root, idx);  in null_free_sector()
701 	if (t_page) {  in null_free_sector()
702 		__clear_bit(sector_bit, t_page->bitmap);  in null_free_sector()
704 		if (null_page_empty(t_page)) {  in null_free_sector()
705 			ret = radix_tree_delete_item(root, idx, t_page);  in null_free_sector()
706 			WARN_ON(ret != t_page);  in null_free_sector()
715 	struct nullb_page *t_page, bool is_cache)  in null_radix_tree_insert()  argument
721 	if (radix_tree_insert(root, idx, t_page)) {  in null_radix_tree_insert()
722 		null_free_page(t_page);  in null_radix_tree_insert()
723 		t_page = radix_tree_lookup(root, idx);  in null_radix_tree_insert()
724 		WARN_ON(!t_page || t_page->page->index != idx);  in null_radix_tree_insert()
728 	return t_page;  in null_radix_tree_insert()
765 	struct nullb_page *t_page;  in __null_lookup_page()  local
772 	t_page = radix_tree_lookup(root, idx);  in __null_lookup_page()
773 	WARN_ON(t_page && t_page->page->index != idx);  in __null_lookup_page()
775 	if (t_page && (for_write || test_bit(sector_bit, t_page->bitmap)))  in __null_lookup_page()
776 		return t_page;  in __null_lookup_page()
799 	struct nullb_page *t_page;  in null_insert_page()  local
801 	t_page = null_lookup_page(nullb, sector, true, ignore_cache);  in null_insert_page()
802 	if (t_page)  in null_insert_page()
803 		return t_page;  in null_insert_page()
807 	t_page = null_alloc_page(GFP_NOIO);  in null_insert_page()
808 	if (!t_page)  in null_insert_page()
816 	t_page->page->index = idx;  in null_insert_page()
817 	t_page = null_radix_tree_insert(nullb, idx, t_page, !ignore_cache);  in null_insert_page()
820 	return t_page;  in null_insert_page()
822 	null_free_page(t_page);  in null_insert_page()
833 	struct nullb_page *t_page, *ret;  in null_flush_cache_page()  local
838 	t_page = null_insert_page(nullb, idx << PAGE_SECTORS_SHIFT, true);  in null_flush_cache_page()
843 		if (t_page && null_page_empty(t_page)) {  in null_flush_cache_page()
845 				idx, t_page);  in null_flush_cache_page()
846 			null_free_page(t_page);  in null_flush_cache_page()
851 	if (!t_page)  in null_flush_cache_page()
855 	dst = kmap_atomic(t_page->page);  in null_flush_cache_page()
863 			__set_bit(i, t_page->bitmap);  in null_flush_cache_page()
935 	struct nullb_page *t_page;  in copy_to_nullb()  local
945 		t_page = null_insert_page(nullb, sector,  in copy_to_nullb()
947 		if (!t_page)  in copy_to_nullb()
951 		dst = kmap_atomic(t_page->page);  in copy_to_nullb()
956 		__set_bit(sector & SECTOR_MASK, t_page->bitmap);  in copy_to_nullb()
972 	struct nullb_page *t_page;  in copy_from_nullb()  local
979 		t_page = null_lookup_page(nullb, sector, false,  in copy_from_nullb()
983 		if (!t_page) {  in copy_from_nullb()
987 		src = kmap_atomic(t_page->page);  in copy_from_nullb()