linux-kernel - [PATCH 03/11] maple_tree: Add some helper functions

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Message-Id: <20230726080916.17454-4-zhangpeng.00@bytedance.com>
Date:   Wed, 26 Jul 2023 16:09:08 +0800
From:   Peng Zhang <zhangpeng.00@...edance.com>
To:     Liam.Howlett@...cle.com, corbet@....net, akpm@...ux-foundation.org,
        willy@...radead.org, brauner@...nel.org, surenb@...gle.com,
        michael.christie@...cle.com, peterz@...radead.org,
        mathieu.desnoyers@...icios.com, npiggin@...il.com, avagin@...il.com
Cc:     linux-mm@...ck.org, linux-doc@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org,
        Peng Zhang <zhangpeng.00@...edance.com>
Subject: [PATCH 03/11] maple_tree: Add some helper functions

Add some helper functions so that their parameters are maple node
instead of maple enode, these functions will be used later.

Signed-off-by: Peng Zhang <zhangpeng.00@...edance.com>
---
 lib/maple_tree.c | 71 +++++++++++++++++++++++++++++++++++++-----------
 1 file changed, 55 insertions(+), 16 deletions(-)

diff --git a/lib/maple_tree.c b/lib/maple_tree.c
index e0e9a87bdb43..da3a2fb405c0 100644
--- a/lib/maple_tree.c
+++ b/lib/maple_tree.c
@@ -164,6 +164,11 @@ static inline int mt_alloc_bulk(gfp_t gfp, size_t size, void **nodes)
 	return kmem_cache_alloc_bulk(maple_node_cache, gfp, size, nodes);
 }
 
+static inline void mt_free_one(struct maple_node *node)
+{
+	kmem_cache_free(maple_node_cache, node);
+}
+
 static inline void mt_free_bulk(size_t size, void __rcu **nodes)
 {
 	kmem_cache_free_bulk(maple_node_cache, size, (void **)nodes);
@@ -432,18 +437,18 @@ static inline unsigned long mte_parent_slot_mask(unsigned long parent)
 }
 
 /*
- * mas_parent_type() - Return the maple_type of the parent from the stored
- * parent type.
- * @mas: The maple state
- * @enode: The maple_enode to extract the parent's enum
+ * ma_parent_type() - Return the maple_type of the parent from the stored parent
+ * type.
+ * @mt: The maple tree
+ * @node: The maple_node to extract the parent's enum
  * Return: The node->parent maple_type
  */
 static inline
-enum maple_type mas_parent_type(struct ma_state *mas, struct maple_enode *enode)
+enum maple_type ma_parent_type(struct maple_tree *mt, struct maple_node *node)
 {
 	unsigned long p_type;
 
-	p_type = (unsigned long)mte_to_node(enode)->parent;
+	p_type = (unsigned long)node->parent;
 	if (WARN_ON(p_type & MAPLE_PARENT_ROOT))
 		return 0;
 
@@ -451,7 +456,7 @@ enum maple_type mas_parent_type(struct ma_state *mas, struct maple_enode *enode)
 	p_type &= ~mte_parent_slot_mask(p_type);
 	switch (p_type) {
 	case MAPLE_PARENT_RANGE64: /* or MAPLE_PARENT_ARANGE64 */
-		if (mt_is_alloc(mas->tree))
+		if (mt_is_alloc(mt))
 			return maple_arange_64;
 		return maple_range_64;
 	}
@@ -459,6 +464,19 @@ enum maple_type mas_parent_type(struct ma_state *mas, struct maple_enode *enode)
 	return 0;
 }
 
+/*
+ * mas_parent_type() - Return the maple_type of the parent from the stored
+ * parent type.
+ * @mas: The maple state
+ * @enode: The maple_enode to extract the parent's enum
+ * Return: The node->parent maple_type
+ */
+static inline
+enum maple_type mas_parent_type(struct ma_state *mas, struct maple_enode *enode)
+{
+	return ma_parent_type(mas->tree, mte_to_node(enode));
+}
+
 /*
  * mas_set_parent() - Set the parent node and encode the slot
  * @enode: The encoded maple node.
@@ -499,14 +517,14 @@ void mas_set_parent(struct ma_state *mas, struct maple_enode *enode,
 }
 
 /*
- * mte_parent_slot() - get the parent slot of @enode.
- * @enode: The encoded maple node.
+ * ma_parent_slot() - get the parent slot of @node.
+ * @node: The maple node.
  *
- * Return: The slot in the parent node where @enode resides.
+ * Return: The slot in the parent node where @node resides.
  */
-static inline unsigned int mte_parent_slot(const struct maple_enode *enode)
+static inline unsigned int ma_parent_slot(const struct maple_node *node)
 {
-	unsigned long val = (unsigned long)mte_to_node(enode)->parent;
+	unsigned long val = (unsigned long)node->parent;
 
 	if (val & MA_ROOT_PARENT)
 		return 0;
@@ -519,15 +537,36 @@ static inline unsigned int mte_parent_slot(const struct maple_enode *enode)
 }
 
 /*
- * mte_parent() - Get the parent of @node.
- * @node: The encoded maple node.
+ * mte_parent_slot() - get the parent slot of @enode.
+ * @enode: The encoded maple node.
+ *
+ * Return: The slot in the parent node where @enode resides.
+ */
+static inline unsigned int mte_parent_slot(const struct maple_enode *enode)
+{
+	return ma_parent_slot(mte_to_node(enode));
+}
+
+/*
+ * ma_parent() - Get the parent of @node.
+ * @node: The maple node.
+ *
+ * Return: The parent maple node.
+ */
+static inline struct maple_node *ma_parent(const struct maple_node *node)
+{
+	return (void *)((unsigned long)(node->parent) & ~MAPLE_NODE_MASK);
+}
+
+/*
+ * mte_parent() - Get the parent of @enode.
+ * @enode: The encoded maple node.
  *
  * Return: The parent maple node.
  */
 static inline struct maple_node *mte_parent(const struct maple_enode *enode)
 {
-	return (void *)((unsigned long)
-			(mte_to_node(enode)->parent) & ~MAPLE_NODE_MASK);
+	return ma_parent(mte_to_node(enode));
 }
 
 /*
-- 
2.20.1