From: Nicholas Bellinger <nab@xxxxxxxxxxxxxxx>
This patch adds support for nvme/loop block integrity,
based upon the reported ID_NS.ms + ID_NS.dps feature
bits in nvmet_execute_identify_ns().
Cc: Jens Axboe <axboe@xxxxxx>
Cc: Christoph Hellwig <hch@xxxxxx>
Cc: Martin Petersen <martin.petersen@xxxxxxxxxx>
Cc: Sagi Grimberg <sagi@xxxxxxxxxxx>
Cc: Hannes Reinecke <hare@xxxxxxx>
Cc: Mike Christie <michaelc@xxxxxxxxxxx>
Signed-off-by: Nicholas Bellinger <nab@xxxxxxxxxxxxxxx>
---
drivers/nvme/target/loop.c | 19 +++++++++++++++++++
1 file changed, 19 insertions(+)
diff --git a/drivers/nvme/target/loop.c b/drivers/nvme/target/loop.c
index 08b4fbb..b4b4da9 100644
--- a/drivers/nvme/target/loop.c
+++ b/drivers/nvme/target/loop.c
@@ -42,6 +42,7 @@ struct nvme_loop_iod {
struct nvme_loop_queue *queue;
struct work_struct work;
struct sg_table sg_table;
+ struct scatterlist meta_sg;
struct scatterlist first_sgl[];
};
@@ -193,6 +194,24 @@ static int nvme_loop_queue_rq(struct blk_mq_hw_ctx *hctx,
BUG_ON(iod->req.sg_cnt > req->nr_phys_segments);
}
+ if (blk_integrity_rq(req)) {
+ int count;
+
+ if (blk_rq_count_integrity_sg(hctx->queue, req->bio) != 1)
+ BUG_ON(1);
+
+ sg_init_table(&iod->meta_sg, 1);
+ count = blk_rq_map_integrity_sg(hctx->queue, req->bio,
+ &iod->meta_sg);
+
+ iod->req.prot_sg = &iod->meta_sg;
+ iod->req.prot_sg_cnt = 1;
+#if 0
+ printk("nvme/loop: Set prot_sg %p and prot_sg_cnt: %d\n",
+ iod->req.prot_sg, iod->req.prot_sg_cnt);
+#endif
+ }
+
iod->cmd.common.command_id = req->tag;
blk_mq_start_request(req);
--
1.9.1
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