linux-ext4 - [PATCH RFC 7/8] open: use super write guard in do

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Message-Id: <20251104-work-guards-v1-7-5108ac78a171@kernel.org>
Date: Tue, 04 Nov 2025 13:12:36 +0100
From: Christian Brauner <brauner@...nel.org>
To: linux-fsdevel@...r.kernel.org
Cc: Alexander Viro <viro@...iv.linux.org.uk>, Jan Kara <jack@...e.cz>, 
 linux-btrfs@...r.kernel.org, linux-ext4@...r.kernel.org, 
 linux-xfs@...r.kernel.org, Christian Brauner <brauner@...nel.org>
Subject: [PATCH RFC 7/8] open: use super write guard in do_ftruncate()

Signed-off-by: Christian Brauner <brauner@...nel.org>
---
 fs/open.c | 9 +++------
 1 file changed, 3 insertions(+), 6 deletions(-)

diff --git a/fs/open.c b/fs/open.c
index 3d64372ecc67..1d73a17192da 100644
--- a/fs/open.c
+++ b/fs/open.c
@@ -191,12 +191,9 @@ int do_ftruncate(struct file *file, loff_t length, int small)
 	if (error)
 		return error;
 
-	sb_start_write(inode->i_sb);
-	error = do_truncate(file_mnt_idmap(file), dentry, length,
-			    ATTR_MTIME | ATTR_CTIME, file);
-	sb_end_write(inode->i_sb);
-
-	return error;
+	scoped_guard(super_write, inode->i_sb)
+		return do_truncate(file_mnt_idmap(file), dentry, length,
+				   ATTR_MTIME | ATTR_CTIME, file);
 }
 
 int do_sys_ftruncate(unsigned int fd, loff_t length, int small)

-- 
2.47.3