Al Viro 4038acdb18 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>

2016-10-03 20:38:55 -04:00

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