Searched hist:ebb718a5c7240f6ffb308e0d0b67a92c3b63b91c (Results 1 – 2 of 2) sorted by relevance
/qemu/tests/qemu-iotests/ |
H A D | 154.out | ebb718a5c7240f6ffb308e0d0b67a92c3b63b91c Thu May 26 03:48:49 UTC 2016 Eric Blake <eblake@redhat.com> 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>
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/qemu/block/ |
H A D | qcow2.c | ebb718a5c7240f6ffb308e0d0b67a92c3b63b91c Thu May 26 03:48:49 UTC 2016 Eric Blake <eblake@redhat.com> 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>
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