linux-kernel - [PATCH 11/13] btrfs: update add_qgroup

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Message-Id: <20250422081504.1998809-11-frank.li@vivo.com>
Date: Tue, 22 Apr 2025 02:15:02 -0600
From: Yangtao Li <frank.li@...o.com>
To: clm@...com,
	josef@...icpanda.com,
	dsterba@...e.com
Cc: linux-btrfs@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Yangtao Li <frank.li@...o.com>
Subject: [PATCH 11/13] btrfs: update add_qgroup_rb to to use rb helper

Update add_qgroup_rb() to use rb_find_add().

Suggested-by: David Sterba <dsterba@...e.com>
Signed-off-by: Yangtao Li <frank.li@...o.com>
---
 fs/btrfs/qgroup.c | 46 ++++++++++++++++++++--------------------------
 1 file changed, 20 insertions(+), 26 deletions(-)

diff --git a/fs/btrfs/qgroup.c b/fs/btrfs/qgroup.c
index 7325dbb16e38..989386311834 100644
--- a/fs/btrfs/qgroup.c
+++ b/fs/btrfs/qgroup.c
@@ -183,6 +183,14 @@ static struct btrfs_qgroup *find_qgroup_rb(const struct btrfs_fs_info *fs_info,
 	return rb_entry_safe(node, struct btrfs_qgroup, node);
 }
 
+static int btrfs_qgroup_cmp(struct rb_node *new, const struct rb_node *exist)
+{
+	const struct btrfs_qgroup *new_qgroup =
+		rb_entry(new, struct btrfs_qgroup, node);
+
+	return btrfs_qgroup_key_cmp(&new_qgroup->qgroupid, exist);
+}
+
 /*
  * Add qgroup to the filesystem's qgroup tree.
  *
@@ -195,39 +203,25 @@ static struct btrfs_qgroup *add_qgroup_rb(struct btrfs_fs_info *fs_info,
 					  struct btrfs_qgroup *prealloc,
 					  u64 qgroupid)
 {
-	struct rb_node **p = &fs_info->qgroup_tree.rb_node;
-	struct rb_node *parent = NULL;
-	struct btrfs_qgroup *qgroup;
+	struct rb_node *exist;
 
 	/* Caller must have pre-allocated @prealloc. */
 	ASSERT(prealloc);
 
-	while (*p) {
-		parent = *p;
-		qgroup = rb_entry(parent, struct btrfs_qgroup, node);
-
-		if (qgroup->qgroupid < qgroupid) {
-			p = &(*p)->rb_left;
-		} else if (qgroup->qgroupid > qgroupid) {
-			p = &(*p)->rb_right;
-		} else {
-			kfree(prealloc);
-			return qgroup;
-		}
+	prealloc->qgroupid = qgroupid;
+	exist = rb_find_add(&prealloc->node, &fs_info->qgroup_tree, btrfs_qgroup_cmp);
+	if (exist) {
+		kfree(prealloc);
+		return rb_entry(exist, struct btrfs_qgroup, node);
 	}
 
-	qgroup = prealloc;
-	qgroup->qgroupid = qgroupid;
-	INIT_LIST_HEAD(&qgroup->groups);
-	INIT_LIST_HEAD(&qgroup->members);
-	INIT_LIST_HEAD(&qgroup->dirty);
-	INIT_LIST_HEAD(&qgroup->iterator);
-	INIT_LIST_HEAD(&qgroup->nested_iterator);
-
-	rb_link_node(&qgroup->node, parent, p);
-	rb_insert_color(&qgroup->node, &fs_info->qgroup_tree);
+	INIT_LIST_HEAD(&prealloc->groups);
+	INIT_LIST_HEAD(&prealloc->members);
+	INIT_LIST_HEAD(&prealloc->dirty);
+	INIT_LIST_HEAD(&prealloc->iterator);
+	INIT_LIST_HEAD(&prealloc->nested_iterator);
 
-	return qgroup;
+	return prealloc;
 }
 
 static void __del_qgroup_rb(struct btrfs_qgroup *qgroup)
-- 
2.39.0