tree 8db90e3852334781391471463224a80ab773afd7
parent 3b7ca26bdf1eb1f9703048831d442adbb103069b
author Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com> 1646336623 +0100
committer Hanna Reitz <hreitz@redhat.com> 1646642011 +0100

block/io: introduce block driver snapshot-access API

Add new block driver handlers and corresponding generic wrappers.
It will be used to allow copy-before-write filter to provide
reach fleecing interface in further commit.

In future this approach may be used to allow reading qcow2 internal
snapshots, for example to export them through NBD.

Signed-off-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
Reviewed-by: Hanna Reitz <hreitz@redhat.com>
Message-Id: <20220303194349.2304213-11-vsementsov@virtuozzo.com>
[hreitz: Rebased on block GS/IO split]
Signed-off-by: Hanna Reitz <hreitz@redhat.com>