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authorChristoph Hellwig <hch@lst.de>2016-11-10 07:32:33 -0800
committerJens Axboe <axboe@fb.com>2016-11-10 10:06:24 -0700
commitd49187e97e94e2eb613cb6fed810356972077cc3 (patch)
treefcfb2353034857d86ded315e5ce139a0cd124c06 /.gitattributes
parent41c9499b221ebe102f776589085cde43d0dadc46 (diff)
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nvme: introduce struct nvme_request
This adds a shared per-request structure for all NVMe I/O. This structure is embedded as the first member in all NVMe transport drivers request private data and allows to implement common functionality between the drivers. The first use is to replace the current abuse of the SCSI command passthrough fields in struct request for the NVMe command passthrough, but it will grow a field more fields to allow implementing things like common abort handlers in the future. The passthrough commands are handled by having a pointer to the SQE (struct nvme_command) in struct nvme_request, and the union of the possible result fields, which had to be turned from an anonymous into a named union for that purpose. This avoids having to pass a reference to a full CQE around and thus makes checking the result a lot more lightweight. Signed-off-by: Christoph Hellwig <hch@lst.de> Reviewed-by: Keith Busch <keith.busch@intel.com> Signed-off-by: Jens Axboe <axboe@fb.com>
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