tree c4492b1ee9661d40f1e2e2b0e88c9ba369a1162f
parent 22c6186ecea0be9eff1c399298ad36e94a59995f
author Al Viro <viro@zeniv.linux.org.uk> 1428367838 -0400
committer Al Viro <viro@zeniv.linux.org.uk> 1428805786 -0400

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>