hi,

> 	ftp://ftp.netbsd.org/pub/NetBSD/misc/chs/diff.directio

>	const int pgoflags = PGO_CLEANIT | PGO_FREE | PGO_SYNCIO;

do you think PGO_FREE is a good idea even when rw == UIO_READ?

>	(void) VOP_PUTPAGES(vp, off, off + len, pgoflags);

you need trunc_page() and round_page().

>	kva = uvm_km_valloc_wait(phys_map, len);

i think you mean klen.

>		rv = pmap_extract(upm, uva + poff, &pa);
>		KASSERT(rv);
>		pmap_enter(kpm, kva + poff, pa, prot, prot | PMAP_WIRED);

uva (thus pa) isn't page-aligned here.

YAMAMOTO Takashi