Unfortunately Gnome Disks was castrated in version 3.6, it is now impossible to repair LUKS encrypted filesystems with the help of Gnome Disks. But you can easily do this within the terminal.
If you are using a LUKS encrypted partition and you want to check whether it has file system errors, you can do this with the following commands:
- Mount and open your LUKS partition:
sudo cryptsetup luksOpen /dev/<yourPartition> <someMountName>
e.g.: sudo cryptsetup luksOpen /dev/sdb3 foo - Run fsck on it to check and auto-repair the filesystem:
sudo fsck -a /dev/mapper/<someMountName>
e.g.: sudo fsck -a /dev/mapper/foo - After the check / repair is finished, do not forget to close your LUKS volume again:
sudo cryptsetup luksClose <someMountName>
e.g. sudo cryptsetup luksClose foo
That's it easy peasy, isn't it ?