btrfs: minimal conversion to errseq_t writeback error reporting on fsync

Just check and advance the errseq_t in the file before returning, and
use an errseq_t based check for writeback errors.

Other internal callers of filemap_* functions are left as-is.

Signed-off-by: Jeff Layton <jlayton@redhat.com>
This commit is contained in:
Jeff Layton 2017-07-06 07:02:31 -04:00
commit 333427a505