From f765b134c0d3f294f6084d3e0a11de184059a387 Mon Sep 17 00:00:00 2001
From: Al Viro <viro@zeniv.linux.org.uk>
Date: Mon, 6 Apr 2015 20:50:38 -0400
Subject: [PATCH] new_sync_write(): discard ->ki_pos unless the return value is
 positive

That allows ->write_iter() instances much more convenient life wrt
iocb->ki_pos (and fixes several filesystems with borderline POSIX
violations when zero-length write succeeds and changes the current
position).

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