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block: assert no image modification under BDRV_O_INACTIVE
As long as BDRV_O_INACTIVE is set, the image file is only opened so we have a file descriptor for it. We're definitely not supposed to modify the image, it's still owned by the migration source. This commit is an addition to 09e0c77 but the assert() is added to bdrv_truncate(). Signed-off-by: Denis V. Lunev <den@openvz.org> CC: Kevin Wolf <kwolf@redhat.com> CC: Max Reitz <mreitz@redhat.com> Message-id: 1491405505-31620-3-git-send-email-den@openvz.org Reviewed-by: Eric Blake <eblake@redhat.com> Signed-off-by: Max Reitz <mreitz@redhat.com>
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