815 	struct nullb_page *t_page;  in null_alloc_page()  local
817 	t_page = kmalloc(sizeof(struct nullb_page), GFP_NOIO);  in null_alloc_page()
818 	if (!t_page)  in null_alloc_page()
821 	t_page->page = alloc_pages(GFP_NOIO, 0);  in null_alloc_page()
822 	if (!t_page->page) {  in null_alloc_page()
823 		kfree(t_page);  in null_alloc_page()
827 	memset(t_page->bitmap, 0, sizeof(t_page->bitmap));  in null_alloc_page()
828 	return t_page;  in null_alloc_page()
831 static void null_free_page(struct nullb_page *t_page)  in null_free_page()  argument
833 	__set_bit(NULLB_PAGE_FREE, t_page->bitmap);  in null_free_page()
834 	if (test_bit(NULLB_PAGE_LOCK, t_page->bitmap))  in null_free_page()
836 	__free_page(t_page->page);  in null_free_page()
837 	kfree(t_page);  in null_free_page()
852 	struct nullb_page *t_page, *ret;  in null_free_sector()  local
859 	t_page = radix_tree_lookup(root, idx);  in null_free_sector()
860 	if (t_page) {  in null_free_sector()
861 		__clear_bit(sector_bit, t_page->bitmap);  in null_free_sector()
863 		if (null_page_empty(t_page)) {  in null_free_sector()
864 			ret = radix_tree_delete_item(root, idx, t_page);  in null_free_sector()
865 			WARN_ON(ret != t_page);  in null_free_sector()
874 	struct nullb_page *t_page, bool is_cache)  in null_radix_tree_insert()  argument
880 	if (radix_tree_insert(root, idx, t_page)) {  in null_radix_tree_insert()
881 		null_free_page(t_page);  in null_radix_tree_insert()
882 		t_page = radix_tree_lookup(root, idx);  in null_radix_tree_insert()
883 		WARN_ON(!t_page || t_page->page->index != idx);  in null_radix_tree_insert()
887 	return t_page;  in null_radix_tree_insert()
924 	struct nullb_page *t_page;  in __null_lookup_page()  local
931 	t_page = radix_tree_lookup(root, idx);  in __null_lookup_page()
932 	WARN_ON(t_page && t_page->page->index != idx);  in __null_lookup_page()
934 	if (t_page && (for_write || test_bit(sector_bit, t_page->bitmap)))  in __null_lookup_page()
935 		return t_page;  in __null_lookup_page()
958 	struct nullb_page *t_page;  in null_insert_page()  local
960 	t_page = null_lookup_page(nullb, sector, true, ignore_cache);  in null_insert_page()
961 	if (t_page)  in null_insert_page()
962 		return t_page;  in null_insert_page()
966 	t_page = null_alloc_page();  in null_insert_page()
967 	if (!t_page)  in null_insert_page()
975 	t_page->page->index = idx;  in null_insert_page()
976 	t_page = null_radix_tree_insert(nullb, idx, t_page, !ignore_cache);  in null_insert_page()
979 	return t_page;  in null_insert_page()
981 	null_free_page(t_page);  in null_insert_page()
992 	struct nullb_page *t_page, *ret;  in null_flush_cache_page()  local
997 	t_page = null_insert_page(nullb, idx << PAGE_SECTORS_SHIFT, true);  in null_flush_cache_page()
1002 		if (t_page && null_page_empty(t_page)) {  in null_flush_cache_page()
1004 				idx, t_page);  in null_flush_cache_page()
1005 			null_free_page(t_page);  in null_flush_cache_page()
1010 	if (!t_page)  in null_flush_cache_page()
1014 	dst = kmap_atomic(t_page->page);  in null_flush_cache_page()
1022 			__set_bit(i, t_page->bitmap);  in null_flush_cache_page()
1094 	struct nullb_page *t_page;  in copy_to_nullb()  local
1104 		t_page = null_insert_page(nullb, sector,  in copy_to_nullb()
1106 		if (!t_page)  in copy_to_nullb()
1110 		dst = kmap_atomic(t_page->page);  in copy_to_nullb()
1115 		__set_bit(sector & SECTOR_MASK, t_page->bitmap);  in copy_to_nullb()
1131 	struct nullb_page *t_page;  in copy_from_nullb()  local
1138 		t_page = null_lookup_page(nullb, sector, false,  in copy_from_nullb()
1142 		if (!t_page) {  in copy_from_nullb()
1146 		src = kmap_atomic(t_page->page);  in copy_from_nullb()