Darrick J. Wong [off-list ref] wrote:

quoted

+struct fsinfo_features {
+	__u8	features[(FSINFO_FEAT__NR + 7) / 8];

Hm...the structure size is pretty small (56 bytes) and will expand as we
add new _FEAT flags.  Is this ok because the fsinfo code will truncate
its response to userspace to whatever buffer size userspace tells it?

Yes.  Also, you can ask fsinfo how many feature bits it supports.

I should put this in the struct first rather than putting it elsewhere.

David