On Thu, Jan 12, 2017 at 12:46:42PM +0100, Ilya Dryomov wrote: > On Thu, Jan 12, 2017 at 12:37 PM, Al Viro <[email protected]> wrote: > > On Thu, Jan 12, 2017 at 12:13:31PM +0100, Ilya Dryomov wrote: > > > >> It would be a significant and wide-reaching change, but I've been > >> meaning to look into switching to iov_iter for a couple of releases > >> now. There is a lot of ugly code in net/ceph/messenger.c to hangle > >> iteration over "page vectors", "page lists" and "bio lists". All of it > >> predates iov_iter proliferation and is mostly incomplete anyway: IIRC > >> you can send out of a pagelist but can't recv into a pagelist, etc. > > > > Wait a sec... Is it done from the same thread that has issued a syscall? > > If so, we certainly could just pass iov_iter without bothering with any > > form of ..._get_pages(); if not, we'll need at least to get from iovec > > to bio_vec, since userland addresses make sense only in the caller's > > context... > > No, not necessarily - it's also used by rbd (all of net/ceph has two > users: fs/ceph and drivers/block/rbd.c).
Yes, but rbd doesn't deal with userland-pointing iovecs at all, does it?
