nvme: fix metadata handling in nvme-passthrough

On an NVMe namespace that does not support metadata, it is possible to
send an IO command with metadata through io-passthru. This allows issues
like [1] to trigger in the completion code path.
nvme_map_user_request() doesn't check if the namespace supports metadata
before sending it forward. It also allows admin commands with metadata to
be processed as it ignores metadata when bdev == NULL and may report
success.

Reject an IO command with metadata when the NVMe namespace doesn't
support it and reject an admin command if it has metadata.

[1] https://lore.kernel.org/all/[email protected]/

Suggested-by: Christoph Hellwig <[email protected]>
Signed-off-by: Puranjay Mohan <[email protected]>
Reviewed-by: Christoph Hellwig <[email protected]>
Reviewed-by: Sagi Grimberg <[email protected]>
Reviewed-by: Anuj Gupta <[email protected]>
Signed-off-by: Keith Busch <[email protected]>

0 files changed, 0 insertions, 0 deletions