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[int13] Automatically reopen underlying block device as needed
We currently use INT 13,00 as an opportunity to reopen the underlying block device, which works well for callers such as DOS that will use INT 13,00 in response to any disk errors. However, some callers (such as Windows Server 2008) do not attempt to reset the disk, and so any failures become effectively permanent. Fix this by automatically reopening the underlying block device whenever we might want to access it. This makes direct installation of Windows to an iSCSI target much more reliable. Signed-off-by: Michael Brown <mcb30@ipxe.org>
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