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H A Ddirect-io.cdiff 4038acdb187e226e72df393ae3dd150df857e8a3 Mon Oct 03 19:38:55 CDT 2016 Al Viro <viro@zeniv.linux.org.uk> consistent treatment of EFAULT on O_DIRECT read/write

Make local filesystems treat a fault as shortened IO,
returning -EFAULT only if nothing had been transferred.
That's how everything else (NFS, FUSE, ceph, Lustre)
behaves.

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>