btrfs: create example debugfs file only in debugging build

Reviewed-by: Eric Sandeen <sandeen@redhat.com>
Signed-off-by: David Sterba <dsterba@suse.com>

diff --git a/fs/btrfs/sysfs.c b/fs/btrfs/sysfs.c
index 804bd1c42e47fd98617c6634ff3311ccd8bc25d4..e498a472ac207733f67d7dc5697f5aacb8989529 100644 (file)
--- a/fs/btrfs/sysfs.c
+++ b/fs/btrfs/sysfs.c
@@ -836,8 +836,17 @@ static int btrfs_init_debugfs(void)
        if (!btrfs_debugfs_root_dentry)
                return -ENOMEM;
 
+       /*
+        * Example code, how to export data through debugfs.
+        *
+        * file:        /sys/kernel/debug/btrfs/test
+        * contents of: btrfs_debugfs_test
+        */
+#ifdef CONFIG_BTRFS_DEBUG
        debugfs_create_u64("test", S_IRUGO | S_IWUSR, btrfs_debugfs_root_dentry,
                        &btrfs_debugfs_test);
+#endif
+
 #endif
        return 0;
 }