xarray: Add range store functionality

This version of xa_store_range() really only supports load and store.
Our only user only needs basic load and store functionality, so there's
no need to do the extra work to support marking and overlapping stores
correctly yet.

Signed-off-by: Matthew Wilcox <willy@infradead.org>

1 files changed, 34 insertions, 0 deletions

diff --git a/lib/test_xarray.c b/lib/test_xarray.c
index 0f06a93b4d0e..aa47754150ce 100644
--- a/lib/test_xarray.c
+++ b/lib/test_xarray.c
@@ -1039,6 +1039,39 @@ static noinline void check_create_range(struct xarray *xa)
 	check_create_range_3();
 }
 
+static noinline void __check_store_range(struct xarray *xa, unsigned long first,
+		unsigned long last)
+{
+#ifdef CONFIG_XARRAY_MULTI
+	xa_store_range(xa, first, last, xa_mk_value(first), GFP_KERNEL);
+
+	XA_BUG_ON(xa, xa_load(xa, first) != xa_mk_value(first));
+	XA_BUG_ON(xa, xa_load(xa, last) != xa_mk_value(first));
+	XA_BUG_ON(xa, xa_load(xa, first - 1) != NULL);
+	XA_BUG_ON(xa, xa_load(xa, last + 1) != NULL);
+
+	xa_store_range(xa, first, last, NULL, GFP_KERNEL);
+#endif
+
+	XA_BUG_ON(xa, !xa_empty(xa));
+}
+
+static noinline void check_store_range(struct xarray *xa)
+{
+	unsigned long i, j;
+
+	for (i = 0; i < 128; i++) {
+		for (j = i; j < 128; j++) {
+			__check_store_range(xa, i, j);
+			__check_store_range(xa, 128 + i, 128 + j);
+			__check_store_range(xa, 4095 + i, 4095 + j);
+			__check_store_range(xa, 4096 + i, 4096 + j);
+			__check_store_range(xa, 123456 + i, 123456 + j);
+			__check_store_range(xa, UINT_MAX + i, UINT_MAX + j);
+		}
+	}
+}
+
 static LIST_HEAD(shadow_nodes);
 
 static void test_update_node(struct xa_node *node)
@@ -1184,6 +1217,7 @@ static int xarray_checks(void)
 	check_destroy(&array);
 	check_move(&array);
 	check_create_range(&array);
+	check_store_range(&array);
 	check_store_iter(&array);
 
 	check_workingset(&array, 0);