2.6.24

 fs

 ext4

diff --git a/fs/ext4/ioctl.c b/fs/ext4/ioctl.c
index c04c7cc..e7f894b 100644
--- a/fs/ext4/ioctl.c
+++ b/fs/ext4/ioctl.c
@@ -51,6 +51,11 @@ int ext4_ioctl (struct inode * inode, struct file * filp, unsigned int cmd,
          flags &= ~EXT4_DIRSYNC_FL;
 
       mutex_lock(&inode->i_mutex);
+      /* Is it quota file? Do not allow user to mess with it */
+      if (IS_NOQUOTA(inode)) {
+         mutex_unlock(&inode->i_mutex);
+         return -EPERM;
+      }
       oldflags = ei->i_flags;
 
       /* The JOURNAL_DATA flag is modifiable only by root */