[PATCH 1/3] quota: Add a new quotactl command Q_XGETQSTATV

[Christoph Hellwig]

Sorry for being late to the game, but I don not like the in-kernel
interface here at all.  Given that Q_XGETQSTATV is a strict superset
of Q_XGETQSTAT there is no need for the second method - just always
fill out the larger in-kernel structure and only copy the smaller
information to userspace for the Q_XGETSTAT case.  That keeps the amount
of code required in the implementations of the methods low and follows
the model used elsewhere in the kernel (e.g. stat and statfs)