vfs: vfs: Define new syscalls preadv2,pwritev2
New syscalls that take an flag argument. No flags are added yet in this patch. Signed-off-by: NMilosz Tanski <milosz@adfin.com> [hch: rebased on top of my kiocb changes] Signed-off-by: NChristoph Hellwig <hch@lst.de> Reviewed-by: NStephen Bates <stephen.bates@pmcs.com> Tested-by: NStephen Bates <stephen.bates@pmcs.com> Acked-by: NJeff Moyer <jmoyer@redhat.com> Signed-off-by: NAl Viro <viro@zeniv.linux.org.uk>
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