Messages in this thread | | | Date | Sat, 12 Jun 2021 23:38:16 +0000 | From | Al Viro <> | Subject | Re: [RFC 5/9] iov_iter: Add iov_iter_fault_in_writeable() |
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On Sat, Jun 12, 2021 at 04:17:30PM -0700, Linus Torvalds wrote: > On Sat, Jun 12, 2021 at 2:47 PM Al Viro <viro@zeniv.linux.org.uk> wrote: > > > > O_DIRECT case is a PITA - there we use GUP and there's no way > > to tell GUP that in the current situation we do *NOT* want to hit > > ->fault()/->page_mkwrite()/etc. pagefault_disable() won't be even > > noticed there... > > Well, we could change that. > > And we do have get_user_pages_fast_only() these days.
FWIW, I'm looking through the users of iov_iter_get_pages{,_alloc}() right now; their semantics feels somewhat wrong. Will follow up when I finish looking through that pile...
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