block: introduce persistent dirty bitmaps
New field BdrvDirtyBitmap.persistent means, that bitmap should be saved by format driver in .bdrv_close and .bdrv_inactivate. No format driver supports it for now. Signed-off-by: NVladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com> Message-id: 20170628120530.31251-18-vsementsov@virtuozzo.com [mreitz: Fixed indentation] Signed-off-by: NMax Reitz <mreitz@redhat.com>
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