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    SubjectRe: [Xen-devel] [PATCH 0/3] xen-blkback: refactor vbd remove/disconnect.
    >>> Joe Jin 08/03/11 4:10 AM >>> 
    >1. start guest with the latest kernel.
    >2. attach new block device by xm block-attach in Dom0
    >3. mount new disk in guest
    >4. execute xm block-detach to detach the block device in dom0 until timeout
    >5. try to unmount the disk in guest, umount hung. at here, any IOs to the
    >device will hang.

    A bogus sequence of operations - an operator in Dom0 shouldn't remove
    a device that is still in use in a guest, except as an exceptionasl measure
    (and then other bad behavior is to be expected). What's the use case?

    Jan


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