Don't run xfsdb if we're not root.

src/fill2fs

@@ -73,7 +73,7 @@ use File::Basename;
 chomp($os = `uname`);
 
 #
-# fsinfo: get filesystem info put it into the global namespace, assigns:
+# fsinfo: get filesystem info put it into the global namespace, initialises:
 #	$dev, $type, $blocks, $used, $avail, $cap, $mnt, $mnt_options
 #	$fsblocks, $fsblocksize, $agblocks, $agcount, $imax_pct, $logblocks
 #	$logstart, $internal
@@ -101,6 +101,8 @@ sub fsinfo {
   @mtab = split(/ +/);
   $mnt_options = $mtab[3];
 
+  # if we're running as root run xfs_db on the filesystem
+  if ($> == 0) {
     # xfs_db: read only, use the default superblock, print everything
     die("Error: $progname: can't read device: \"$dev\"\n") if (! -r $dev);
     $_=`xfs_db -r -c sb -c p $dev`;
@@ -123,6 +125,7 @@ Filesystem information:
   agcount=$agcount; agblocks=$agblocks; logblocks=$logblocks; logstart=$logstart$internal
 EOF
   }
+}
 
 
 # returns numbers with a normal distribution