tree d6cbb0fe14f9990208ffd1c39ad8436f4e6a7d49
parent 0f6c94988afdf38228abdaf0b5504cc115f63836
author Andrey Shinkevich <andrey.shinkevich@virtuozzo.com> 1608099423 +0300
committer Max Reitz <mreitz@redhat.com> 1611668197 +0100

block: apply COR-filter to block-stream jobs

This patch completes the series with the COR-filter applied to
block-stream operations.

Adding the filter makes it possible in future implement discarding
copied regions in backing files during the block-stream job, to reduce
the disk overuse (we need control on permissions).

Also, the filter now is smart enough to do copy-on-read with specified
base, so we have benefit on guest reads even when doing block-stream of
the part of the backing chain.

Several iotests are slightly modified due to filter insertion.

Signed-off-by: Andrey Shinkevich <andrey.shinkevich@virtuozzo.com>
Signed-off-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
Message-Id: <20201216061703.70908-14-vsementsov@virtuozzo.com>
Reviewed-by: Max Reitz <mreitz@redhat.com>
Signed-off-by: Max Reitz <mreitz@redhat.com>