[PATCH v4 10/17] maple_tree: convert mas_insert() to preallocate nodes

[Sidhartha Kumar <sidhartha.kumar@oracle.com>]

By setting the store type in mas_insert(), we no longer need to use
mas_wr_modify() to determine the correct store function to use. Instead,
set the store type and call mas_wr_store_entry(). Also, pass in the
requested gfp flags to mas_insert() so they can be passed to the call to
mas_wr_preallocate().

Reviewed-by: Liam R. Howlett <Liam.Howlett@oracle.com>
Signed-off-by: Sidhartha Kumar <sidhartha.kumar@oracle.com>
---
 lib/maple_tree.c | 22 ++++++++++------------
 1 file changed, 10 insertions(+), 12 deletions(-)

diff --git a/lib/maple_tree.c b/lib/maple_tree.c
index 2242e07a46dc..bb940f61d713 100644
--- a/lib/maple_tree.c
+++ b/lib/maple_tree.c
@@ -4457,26 +4457,24 @@ static inline void *mas_insert(struct ma_state *mas, void *entry)
 	if (wr_mas.content)
 		goto exists;
 
-	if (mas_is_none(mas) || mas_is_ptr(mas)) {
-		mas_store_root(mas, entry);
+	mas_wr_preallocate(&wr_mas, entry);
+	if (mas_is_err(mas))
 		return NULL;
-	}
 
 	/* spanning writes always overwrite something */
-	if (!mas_wr_walk(&wr_mas))
+	if (mas->store_type == wr_spanning_store)
 		goto exists;
 
 	/* At this point, we are at the leaf node that needs to be altered. */
-	wr_mas.offset_end = mas->offset;
-	wr_mas.end_piv = wr_mas.r_max;
-
-	if (wr_mas.content || (mas->last > wr_mas.r_max))
-		goto exists;
+	if (mas->store_type != wr_new_root && mas->store_type != wr_store_root) {
+		wr_mas.offset_end = mas->offset;
+		wr_mas.end_piv = wr_mas.r_max;
 
-	if (!entry)
-		return NULL;
+		if (wr_mas.content || (mas->last > wr_mas.r_max))
+			goto exists;
+	}
 
-	mas_wr_modify(&wr_mas);
+	mas_wr_store_entry(&wr_mas);
 	return wr_mas.content;
 
 exists:
-- 
2.46.0