--- fs/btrfs/volumes.c

+++ fs/btrfs/volumes.c

@@ -21,6 +21,7 @@

#include <linux/blkdev.h>

#include <linux/random.h>

#include <linux/iocontext.h>

+#include <linux/capability.h>

#include <asm/div64.h>

#include "compat.h"

#include "ctree.h"

@@ -1900,6 +1901,9 @@ int btrfs_balance(struct btrfs_root *dev

if (dev_root->fs_info->sb->s_flags & MS_RDONLY)

return -EROFS;

+ if (!capable(CAP_SYS_ADMIN))

+ return -EPERM;

+

mutex_lock(&dev_root->fs_info->volume_mutex);

dev_root = dev_root->fs_info->dev_root;