On Thu, Aug 06, 2020 at 01:52:42PM +0800, Chao Leng wrote:

NVME_SC_LBA_RANGE should failfast, because retry can not success.

The DNR bit is how NVMe conveys such things.

NVME_SC_NS_NOT_READY may retry success, but the probality is very low.
NVME_SC_CMD_INTERRUPTED need retry, according to protocol define, retry will success.

If the upper layers set a request such that "noretry" is true, that's
the behavior you're going to get. Sprinkling special exceptions around
is not a good idea.

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