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nvme: add helper nvme_setup_cmd()

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This moves nvme_setup_{flush,discard,rw} calls into a common
nvme_setup_cmd() helper. So we can eventually hide all the command
setup in the core module and don't even need to update the fabrics
drivers for any specific command type.

Signed-off-by: Ming Lin <ming.l@ssi.samsung.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Jens Axboe <axboe@fb.com>
This commit is contained in:
Ming Lin
2016-04-12 13:10:14 -06:00
committed by Jens Axboe
parent 03b5929ebb
commit 8093f7ca73
3 changed files with 108 additions and 97 deletions
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47
drivers/nvme/host/pci.c
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@@ -593,43 +593,6 @@ static void nvme_unmap_data(struct nvme_dev *dev, struct request *req)
nvme_free_iod(dev, req);
}
static inline int nvme_setup_discard(struct nvme_ns *ns, struct request *req,
struct nvme_command *cmnd)
{
struct nvme_dsm_range *range;
struct page *page;
int offset;
unsigned int nr_bytes = blk_rq_bytes(req);
range = kmalloc(sizeof(*range), GFP_ATOMIC);
if (!range)
return BLK_MQ_RQ_QUEUE_BUSY;
range->cattr = cpu_to_le32(0);
range->nlb = cpu_to_le32(nr_bytes >> ns->lba_shift);
range->slba = cpu_to_le64(nvme_block_nr(ns, blk_rq_pos(req)));
memset(cmnd, 0, sizeof(*cmnd));
cmnd->dsm.opcode = nvme_cmd_dsm;
cmnd->dsm.nsid = cpu_to_le32(ns->ns_id);
cmnd->dsm.nr = 0;
cmnd->dsm.attributes = cpu_to_le32(NVME_DSMGMT_AD);
req->completion_data = range;
page = virt_to_page(range);
offset = offset_in_page(range);
blk_add_request_payload(req, page, offset, sizeof(*range));
/*
* we set __data_len back to the size of the area to be discarded
* on disk. This allows us to report completion on the full amount
* of blocks described by the request.
*/
req->__data_len = nr_bytes;
return 0;
}
/*
* NOTE: ns is NULL when called on the admin queue.
*/
@@ -662,15 +625,7 @@ static int nvme_queue_rq(struct blk_mq_hw_ctx *hctx,
if (ret)
return ret;
if (req->cmd_type == REQ_TYPE_DRV_PRIV)
memcpy(&cmnd, req->cmd, sizeof(cmnd));
else if (req->cmd_flags & REQ_FLUSH)
nvme_setup_flush(ns, &cmnd);
else if (req->cmd_flags & REQ_DISCARD)
ret = nvme_setup_discard(ns, req, &cmnd);
else
nvme_setup_rw(ns, req, &cmnd);
ret = nvme_setup_cmd(ns, req, &cmnd);
if (ret)
goto out;