linux-kernel - [PATCH 1/4] configfs: return -ENAMETOOLONG earlier in configfs

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Date:   Wed, 25 Aug 2021 08:49:03 +0200
From:   Christoph Hellwig <hch@....de>
To:     Joel Becker <jlbec@...lplan.org>
Cc:     Sishuai Gong <sishuai@...due.edu>,
        Al Viro <viro@...iv.linux.org.uk>,
        linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org
Subject: [PATCH 1/4] configfs: return -ENAMETOOLONG earlier in configfs_lookup

Just like most other file systems: get the simple checks out of the
way first.

Signed-off-by: Christoph Hellwig <hch@....de>
---
 fs/configfs/dir.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/fs/configfs/dir.c b/fs/configfs/dir.c
index ac5e0c0e9181..cf08bbde55f3 100644
--- a/fs/configfs/dir.c
+++ b/fs/configfs/dir.c
@@ -456,6 +456,9 @@ static struct dentry * configfs_lookup(struct inode *dir,
 	int found = 0;
 	int err;
 
+	if (dentry->d_name.len > NAME_MAX)
+		return ERR_PTR(-ENAMETOOLONG);
+
 	/*
 	 * Fake invisibility if dir belongs to a group/default groups hierarchy
 	 * being attached
@@ -486,8 +489,6 @@ static struct dentry * configfs_lookup(struct inode *dir,
 		 * If it doesn't exist and it isn't a NOT_PINNED item,
 		 * it must be negative.
 		 */
-		if (dentry->d_name.len > NAME_MAX)
-			return ERR_PTR(-ENAMETOOLONG);
 		d_add(dentry, NULL);
 		return NULL;
 	}
-- 
2.30.2