On Fri, Apr 9, 2021 at 4:39 PM Luis Henriques <lhenriq...@suse.de> wrote:
>
> Nicolas Boichat <drink...@chromium.org> writes:
>
> > On Wed, Feb 24, 2021 at 6:44 PM Nicolas Boichat <drink...@chromium.org>
> > wrote:
> >>
> >> On Wed, Feb 24, 2021 at 6:22 PM Luis Henriques <lhenriq...@suse.de> wrote:
> >> >
> >> > On Tue, Feb 23, 2021 at 08:00:54PM -0500, Olga Kornievskaia wrote:
> >> > > On Mon, Feb 22, 2021 at 5:25 AM Luis Henriques <lhenriq...@suse.de>
> >> > > wrote:
> >> > > >
> >> > > > A regression has been reported by Nicolas Boichat, found while using
> >> > > > the
> >> > > > copy_file_range syscall to copy a tracefs file. Before commit
> >> > > > 5dae222a5ff0 ("vfs: allow copy_file_range to copy across devices")
> >> > > > the
> >> > > > kernel would return -EXDEV to userspace when trying to copy a file
> >> > > > across
> >> > > > different filesystems. After this commit, the syscall doesn't fail
> >> > > > anymore
> >> > > > and instead returns zero (zero bytes copied), as this file's content
> >> > > > is
> >> > > > generated on-the-fly and thus reports a size of zero.
> >> > > >
> >> > > > This patch restores some cross-filesystem copy restrictions that
> >> > > > existed
> >> > > > prior to commit 5dae222a5ff0 ("vfs: allow copy_file_range to copy
> >> > > > across
> >> > > > devices"). Filesystems are still allowed to fall-back to the VFS
> >> > > > generic_copy_file_range() implementation, but that has now to be done
> >> > > > explicitly.
> >> > > >
> >> > > > nfsd is also modified to fall-back into generic_copy_file_range() in
> >> > > > case
> >> > > > vfs_copy_file_range() fails with -EOPNOTSUPP or -EXDEV.
> >> > > >
> >> > > > Fixes: 5dae222a5ff0 ("vfs: allow copy_file_range to copy across
> >> > > > devices")
> >> > > > Link:
> >> > > > https://lore.kernel.org/linux-fsdevel/20210212044405.4120619-1-drink...@chromium.org/
> >> > > > Link:
> >> > > > https://lore.kernel.org/linux-fsdevel/CANMq1KDZuxir2LM5jOTm0xx+BnvW=zmpsg47cyhfjwnw7zs...@mail.gmail.com/
> >> > > > Link:
> >> > > > https://lore.kernel.org/linux-fsdevel/20210126135012.1.If45b7cdc3ff707bc1efa17f5366057d60603c45f@changeid/
> >> > > > Reported-by: Nicolas Boichat <drink...@chromium.org>
> >> > > > Signed-off-by: Luis Henriques <lhenriq...@suse.de>
> >> > >
> >> > > I tested v8 and I believe it works for NFS.
> >> >
> >> > Thanks a lot for the testing. And to everyone else for reviews,
> >> > feedback,... and patience.
> >>
> >> Thanks so much to you!!!
> >>
> >> Works here, you can add my
> >> Tested-by: Nicolas Boichat <drink...@chromium.org>
> >
> > What happened to this patch? It does not seem to have been picked up
> > yet? Any reason why?
>
> Hmm... good question. I'm not actually sure who would be picking it. Al,
> maybe...?
>
Darrick,
Would you mind taking this through your tree in case Al doesn't pick it up?
Thanks,
Amir.
