On Sat, Jan 07, 2023 at 07:44:37PM +0000, Richard W.M. Jones wrote: > > This is upstream in nbdkit now: > https://gitlab.com/nbdkit/nbdkit/-/tree/master/plugins/blkio > > Another question: > > (6) vhost-user + "read-only" property acts a bit strangely. After > opening virtio-blk-vhost-user it throws an EROFS error if you try to > "blkio_start" it. However if you set the "read-only" property to true > then it's OK to start it, and subsequent read operations work too. > > I would expect that any device can be started without needing to set > this property, and in general I don't understand why vhost-user is r/o > since everything I read about it seems to indicate it's a general > purpose writable protocol.
I guess the vhost-user-blk server is read-only and that's why it's refusing to blkio_start() unless readonly was set to true. If you're using qemu-storage-daemon, set the writable=on parameter on the export. Stefan
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