[PATCH v2 1/5] xfs_repair: refuse to run if we don't recognize version or feature flags

[Eric Sandeen]

On 5/27/15 11:04 AM, Fanael Linithien wrote:
> I'm not entirely sure silently ignoring unknown compat features in
> xfs_repair is a good idea. Consider this ext2 example: xattr support
> is a compat flag. It's okay to rw mount a FS with xattrs on some
> ancient (or non-Linux) kernel without xattr support — everything will
> be fine, even though there's no way to access them — but if the fsck
> tool doesn't understand them, it wouldn't be able to diagnose xattr
> corruption.

Hm, good point.  We have no "compat" features atm, so it's not really clear;
if nothing else, though, those features will have to go un-checked, if there
is any checking to do.  So yeah, maybe best to keep it as an exclusion.

-Eric