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qcow2: add bitmaps extension

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Add bitmap extension as specified in docs/specs/qcow2.txt.
For now, just mirror extension header into Qcow2 state and check
constraints. Also, calculate refcounts for qcow2 bitmaps, to not break
qemu-img check.

For now, disable image resize if it has bitmaps. It will be fixed later.

Signed-off-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
Reviewed-by: Max Reitz <mreitz@redhat.com>
Reviewed-by: John Snow <jsnow@redhat.com>
Message-id: 20170628120530.31251-9-vsementsov@virtuozzo.com
Signed-off-by: Max Reitz <mreitz@redhat.com>
This commit is contained in:
Vladimir Sementsov-Ogievskiy 2017-06-28 15:05:08 +03:00 • committed by Max Reitz
parent 8a5bb1f114
commit 88ddffae8f
5 changed files with 593 additions and 6 deletions
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6
block/qcow2-refcount.c
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@ -1869,6 +1869,12 @@ static int calculate_refcounts(BlockDriverState *bs, BdrvCheckResult *res,
}
}
/* bitmaps */
ret = qcow2_check_bitmaps_refcounts(bs, res, refcount_table, nb_clusters);
if (ret < 0) {
return ret;
}
return check_refblocks(bs, res, fix, rebuild, refcount_table, nb_clusters);
}