On Mon, Jun 10, 2019 at 09:06:16AM -0700, Darrick J. Wong wrote: > On Mon, Jun 10, 2019 at 09:31:31AM -0400, Theodore Ts'o wrote: > > On Mon, Jun 10, 2019 at 09:37:32AM +0300, Amir Goldstein wrote: > > > > > >Why do you think thhis is xfs_io fall back and not kernel fall back to > > >do_splice_direct()? Anyway, both cases allow read from swapfile > > >on upstream. > > > > Ah, I had assumed this was changed that was made because if you are > > implementing copy_file_range in terms of some kind of reflink-like > > mechanism, it becomes super-messy since you know have to break tons > > and tons of COW sharing each time the kernel swaps to the swap file. > > > > I didn't think we had (or maybe we did, and I missed it) a discussion > > about whether reading from a swap file should be prohibited. > > Personally, I think it's security theatre, and not worth the > > effort/overhead, but whatever.... my main complaint was with the > > unnecessary test failures with upstream kernels. > > > > > Trying to understand the desired flow of tests and fixes. > > > I agree that generic/554 failure may be a test/interface bug that > > > we should fix in a way that current upstream passes the test for > > > ext4. Unless there is objection, I will send a patch to fix the test > > > to only test copy *to* swapfile. > > > > > > generic/553, OTOH, is expected to fail on upstream kernel. > > > Are you leaving 553 in appliance build in anticipation to upstream fix? > > > I guess the answer is in the ext4 IS_IMMUTABLE patch that you > > > posted and plan to push to upstream/stable sooner than VFS patches. > > > > So I find it kind of annoying when tests land before the fixes do > > upstream. I still have this in my global_exclude file: > > Yeah, it's awkward for VFS fixes because on the one hand we don't want > to have multiyear regressions like generic/484, but OTOH stuffing tests > in before code goes upstream enables broader testing by the other fs > maintainers. > > In any case, the fixes are in the copy-range-fixes branch which I'm > finally publishing... > > > # The proposed fix for generic/484, "locks: change POSIX lock > > # ownership on execve when files_struct is displaced" would break NFS > > # Jeff Layton and Eric Biederman have some ideas for how to address it > > # but fixing it is non-trivial > > Also, uh, can we remove this from the auto and quick groups for now? I'm fine with that :) Thanks, Eryu
