[bug] label cli hangs until balance is completed

[Anand Jain <Anand.Jain@xxxxxxxxxx>]

 'btrfs fi label /btrfs' will hang until balance is completed.
 (and probably even set label would hang). This is because we
 are trying to hold volume_mutex lock which balance will hold
 during its tenure.

-------
static int btrfs_ioctl_get_fslabel(struct file *file, void __user *arg)
::
        mutex_lock(&root->fs_info->volume_mutex);
        ret = copy_to_user(arg, label, len);
        mutex_unlock(&root->fs_info->volume_mutex);
--------

 I doubt if get label would need such a heavy weight lock?
 Do we have any other lock which could fit better here ?
 Any comments ?

Thanks,  Anand


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