btrfs: Require CAP_SYS_ADMIN for filesystem rebalance

Commit Message

Ben Hutchings Dec. 29, 2010, 2:55 p.m. UTC

None

Patch

diff --git a/fs/btrfs/volumes.c b/fs/btrfs/volumes.c
index cc04dc1..2313e8b 100644
--- a/fs/btrfs/volumes.c
+++ b/fs/btrfs/volumes.c
@@ -22,6 +22,7 @@ 
 #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"
@@ -1905,6 +1906,9 @@  int btrfs_balance(struct btrfs_root *dev_root)
 	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;