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Most export types install BlockDeviceOps pointers. It is easy to forget to remove them because that happens automatically via the "drive" qdev property in hw/ but not block/export/. Put blk_set_dev_ops(blk, NULL, NULL) calls in the core export.c code so the export types don't need to remember. This fixes the nbd and vhost-user-blk export types. Fixes:fd6afc501a("nbd/server: Use drained block ops to quiesce the server") Fixes:ca858a5fe9("vhost-user-blk-server: notify client about disk resize") Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com> Reviewed-by: Eric Blake <eblake@redhat.com> Message-Id: <20230502211119.720647-1-stefanha@redhat.com> Signed-off-by: Eric Blake <eblake@redhat.com>