Messages in this thread | | | Date | Thu, 22 Jan 2015 07:49:30 -0800 | From | Christoph Hellwig <> | Subject | Re: [PATCH 1/1] NVMe: Do not take nsid while a passthrough IO command is being issued via a block device file descriptor |
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On Thu, Jan 22, 2015 at 03:21:28PM +0000, Keith Busch wrote: > The case I considered was the "hidden" attribute in the NVMe LBA Range > Type feature. It only indicates the storage should be hidden from the OS > for general use, but the host may still use it for special purposes. In > truth, the driver doesn't handle the hidden attribute very well and it > doesn't seem like a well thought out feature in the spec anyway.
At least for Linux we should simply ignore that attribute.
> But if you really need to restrict namespace access, shouldn't that be > enforced on the target side with reservations or similar mechanism?
Think for example about containers where we give eah container access to a single nvme namespace, including container root access. Here you don't really want container A to be able to submit I/O for another container. A similar case exists for virtualization where we had problems with SCSI passthrough from guests.
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