linux-kernel - [PATCH 11/18] maple_tree: use store type in mas_wr_store

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Date: Tue,  4 Jun 2024 10:41:38 -0700
From: Sidhartha Kumar <sidhartha.kumar@...cle.com>
To: linux-kernel@...r.kernel.org, maple-tree@...ts.infradead.org
Cc: linux-mm@...ck.org, akpm@...ux-foundation.org, liam.howlett@...cle.com,
        zhangpeng.00@...edance.com, willy@...radead.org,
        Sidhartha Kumar <sidhartha.kumar@...cle.com>
Subject: [PATCH 11/18] maple_tree: use store type in mas_wr_store_entry()

When storing an entry, we can read the store type that was set from a
previous partial walk of the tree. Now that the type of store is known,
select the correct write helper function to use to complete the store.

Signed-off-by: Sidhartha Kumar <sidhartha.kumar@...cle.com>
---
 lib/maple_tree.c | 47 +++++++++++++++++++++++++++++++----------------
 1 file changed, 31 insertions(+), 16 deletions(-)

diff --git a/lib/maple_tree.c b/lib/maple_tree.c
index abd2f396bb1e..20e9d13c2980 100644
--- a/lib/maple_tree.c
+++ b/lib/maple_tree.c
@@ -4206,27 +4206,42 @@ static inline void mas_wr_modify(struct ma_wr_state *wr_mas)
 static inline void *mas_wr_store_entry(struct ma_wr_state *wr_mas)
 {
 	struct ma_state *mas = wr_mas->mas;
+	unsigned char new_end = mas_wr_new_end(wr_mas);
 
-	wr_mas->content = mas_start(mas);
-	if (mas_is_none(mas) || mas_is_ptr(mas)) {
+	switch (mas->store_type) {
+	case wr_invalid:
+		MT_BUG_ON(mas->tree, 1);
+		return NULL;
+	case wr_new_root:
+		mas_new_root(mas, wr_mas->entry);
+		break;
+	case wr_store_root:
 		mas_store_root(mas, wr_mas->entry);
-		return wr_mas->content;
-	}
-
-	if (unlikely(!mas_wr_walk(wr_mas))) {
+		break;
+	case wr_exact_fit:
+		rcu_assign_pointer(wr_mas->slots[mas->offset], wr_mas->entry);
+		if (!!wr_mas->entry ^ !!wr_mas->content)
+			mas_update_gap(mas);
+		break;
+	case wr_append:
+		mas_wr_append(wr_mas, new_end);
+		break;
+	case wr_slot_store:
+		mas_wr_slot_store(wr_mas);
+		break;
+	case wr_node_store:
+		mas_wr_node_store(wr_mas, new_end);
+		break;
+	case wr_spanning_store:
 		mas_wr_spanning_store(wr_mas);
-		return wr_mas->content;
-	}
-
-	/* At this point, we are at the leaf node that needs to be altered. */
-	mas_wr_end_piv(wr_mas);
-	/* New root for a single pointer */
-	if (unlikely(!mas->index && mas->last == ULONG_MAX)) {
-		mas_new_root(mas, wr_mas->entry);
-		return wr_mas->content;
+		break;
+	case wr_split_store:
+	case wr_rebalance:
+	case wr_bnode:
+		mas_wr_bnode(wr_mas);
+		break;
 	}
 
-	mas_wr_modify(wr_mas);
 	return wr_mas->content;
 }
 
-- 
2.45.1