Eric Blake ebb718a5c7 qcow2: Catch more unaligned write_zero into zero cluster
is_zero_cluster() and is_zero_cluster_top_locked() are used only
by qcow2_co_write_zeroes().  The former is too broad (we don't
care if the sectors we are about to overwrite are non-zero, only
that all other sectors in the cluster are zero), so it needs to
be called up to twice but with smaller limits - rename it along
with adding the neeeded parameter.  The latter can be inlined for
more compact code.

The testsuite change shows that we now have a sparser top file
when an unaligned write_zeroes overwrites the only portion of
the backing file with data.

Based on a patch proposal by Denis V. Lunev.

CC: Denis V. Lunev <den@openvz.org>
Signed-off-by: Eric Blake <eblake@redhat.com>
Reviewed-by: Denis V. Lunev <den@openvz.org>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
2016-06-08 10:21:08 +02:00
..
2016-05-18 15:04:27 +03:00
2016-05-12 09:47:54 +02:00
2016-02-23 12:43:05 +00:00
2016-02-23 12:43:05 +00:00
2016-06-02 14:26:57 +01:00
2016-02-16 14:29:27 +00:00
2016-06-07 18:19:25 +03:00
2016-02-16 14:29:27 +00:00
2016-06-07 16:34:45 +01:00