linux-kernel - [PATCH v2 03/15] btrfs: use rb_find() in ulist_rbtree

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Message-Id: <20250516030333.3758-4-panchuang@vivo.com>
Date: Fri, 16 May 2025 11:03:21 +0800
From: Pan Chuang <panchuang@...o.com>
To: clm@...com,
	josef@...icpanda.com,
	dsterba@...e.com,
	frank.li@...o.com
Cc: linux-btrfs@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Pan Chuang <panchuang@...o.com>
Subject: [PATCH v2 03/15] btrfs: use rb_find() in ulist_rbtree_search()

From: Yangtao Li <frank.li@...o.com>

Use the rb-tree helper so we don't open code the search code.

Signed-off-by: Yangtao Li <frank.li@...o.com>
Signed-off-by: Pan Chuang <panchuang@...o.com>
---
v2:
 - Standardize coding style without logical change.
---
 fs/btrfs/ulist.c | 30 +++++++++++++++++-------------
 1 file changed, 17 insertions(+), 13 deletions(-)

diff --git a/fs/btrfs/ulist.c b/fs/btrfs/ulist.c
index fc59b57257d6..e1a4e8643685 100644
--- a/fs/btrfs/ulist.c
+++ b/fs/btrfs/ulist.c
@@ -129,21 +129,25 @@ void ulist_free(struct ulist *ulist)
 	kfree(ulist);
 }
 
+static int ulist_node_val_key_cmp(const void *key, const struct rb_node *node)
+{
+	const u64 *val = key;
+	const struct ulist_node *u = rb_entry(node, struct ulist_node, rb_node);
+
+	if (u->val < *val)
+		return 1;
+	else if (u->val > *val)
+		return -1;
+
+	return 0;
+}
+
 static struct ulist_node *ulist_rbtree_search(struct ulist *ulist, u64 val)
 {
-	struct rb_node *n = ulist->root.rb_node;
-	struct ulist_node *u = NULL;
-
-	while (n) {
-		u = rb_entry(n, struct ulist_node, rb_node);
-		if (u->val < val)
-			n = n->rb_right;
-		else if (u->val > val)
-			n = n->rb_left;
-		else
-			return u;
-	}
-	return NULL;
+	struct rb_node *node;
+
+	node = rb_find(&val, &ulist->root, ulist_node_val_key_cmp);
+	return rb_entry_safe(node, struct ulist_node, rb_node);
 }
 
 static void ulist_rbtree_erase(struct ulist *ulist, struct ulist_node *node)
-- 
2.39.0