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>

parent 08895a8b

fs/direct-io.c

+3 −0

Original line number	Diff line number	Diff line
		@@ -246,6 +246,9 @@ static ssize_t dio_complete(struct dio *dio, ssize_t ret, bool is_async)
		if ((dio->op == REQ_OP_READ) &&
		((offset + transferred) > dio->i_size))
		transferred = dio->i_size - offset;
		/* ignore EFAULT if some IO has been done */
		if (unlikely(ret == -EFAULT) && transferred)
		ret = 0;
		}

		if (ret == 0)