btrfs: use super write guard btrfs_run_defrag_inode()

Link: https://patch.msgid.link/20251104-work-guards-v1-3-5108ac78a171@kernel.org
Signed-off-by: Christian Brauner <brauner@kernel.org>

Author: brauner

fs/btrfs/defrag.c

@@ -254,10 +254,9 @@ static int btrfs_run_defrag_inode(struct btrfs_fs_info *fs_info,
 	range.extent_thresh = defrag->extent_thresh;
 	file_ra_state_init(ra, inode->vfs_inode.i_mapping);
 
-	sb_start_write(fs_info->sb);
-	ret = btrfs_defrag_file(inode, ra, &range, defrag->transid,
-				BTRFS_DEFRAG_BATCH);
-	sb_end_write(fs_info->sb);
+	scoped_guard(super_write, fs_info->sb)
+		ret = btrfs_defrag_file(inode, ra, &range,
+					defrag->transid, BTRFS_DEFRAG_BATCH);
 	iput(&inode->vfs_inode);
 
 	if (ret < 0)