Linux Tips: run fsck on a loopback filesystem

If you want to run fsck on a loopback filesystem (normally a virtual machine disk image like xen for ex.) you just have to tell its proper filesystem type when you run fsck:

fsck.ext3 /path/to/loopbackfile.ext3

for ext3 or:

fsck.reiserfs /path/to/loopbackfile.reiserfs

for reiserfs, etc.