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nvmet: add error log support for bdev backend 

This patch adds the support for the block device backend to populate the
error log entries. Here we map the blk_status_t to the NVMe status.

Signed-off-by: Chaitanya Kulkarni <chaitanya.kulkarni@wdc.com>
Reviewed-by: Sagi Grimberg <sagi@grimberg.me>
Signed-off-by: Christoph Hellwig <hch@lst.de>
This commit is contained in:
Chaitanya Kulkarni 2018-12-12 15:11:42 -08:00 committed by Christoph Hellwig
parent 2da6e00580
commit 3b031d1599
1 changed files with 72 additions and 12 deletions
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84
drivers/nvme/target/io-cmd-bdev.c
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@ -44,13 +44,69 @@ void nvmet_bdev_ns_disable(struct nvmet_ns *ns)
}
}
static u16 blk_to_nvme_status(struct nvmet_req *req, blk_status_t blk_sts)
{
u16 status = NVME_SC_SUCCESS;
if (likely(blk_sts == BLK_STS_OK))
return status;
/*
* Right now there exists M : 1 mapping between block layer error
* to the NVMe status code (see nvme_error_status()). For consistency,
* when we reverse map we use most appropriate NVMe Status code from
* the group of the NVMe staus codes used in the nvme_error_status().
*/
switch (blk_sts) {
case BLK_STS_NOSPC:
status = NVME_SC_CAP_EXCEEDED | NVME_SC_DNR;
req->error_loc = offsetof(struct nvme_rw_command, length);
break;
case BLK_STS_TARGET:
status = NVME_SC_LBA_RANGE | NVME_SC_DNR;
req->error_loc = offsetof(struct nvme_rw_command, slba);
break;
case BLK_STS_NOTSUPP:
req->error_loc = offsetof(struct nvme_common_command, opcode);
switch (req->cmd->common.opcode) {
case nvme_cmd_dsm:
case nvme_cmd_write_zeroes:
status = NVME_SC_ONCS_NOT_SUPPORTED | NVME_SC_DNR;
break;
default:
status = NVME_SC_INVALID_OPCODE | NVME_SC_DNR;
}
break;
case BLK_STS_MEDIUM:
status = NVME_SC_ACCESS_DENIED;
req->error_loc = offsetof(struct nvme_rw_command, nsid);
break;
case BLK_STS_IOERR:
/* fallthru */
default:
status = NVME_SC_INTERNAL | NVME_SC_DNR;
req->error_loc = offsetof(struct nvme_common_command, opcode);
}
switch (req->cmd->common.opcode) {
case nvme_cmd_read:
case nvme_cmd_write:
req->error_slba = le64_to_cpu(req->cmd->rw.slba);
break;
case nvme_cmd_write_zeroes:
req->error_slba =
le64_to_cpu(req->cmd->write_zeroes.slba);
break;
default:
req->error_slba = 0;
}
return status;
}
static void nvmet_bio_done(struct bio *bio)
{
struct nvmet_req *req = bio->bi_private;
nvmet_req_complete(req,
bio->bi_status ? NVME_SC_INTERNAL | NVME_SC_DNR : 0);
nvmet_req_complete(req, blk_to_nvme_status(req, bio->bi_status));
if (bio != &req->b.inline_bio)
bio_put(bio);
}
@ -136,18 +192,21 @@ u16 nvmet_bdev_flush(struct nvmet_req *req)
return 0;
}
static u16 nvmet_bdev_discard_range(struct nvmet_ns *ns,
static u16 nvmet_bdev_discard_range(struct nvmet_req *req,
struct nvme_dsm_range *range, struct bio **bio)
{
struct nvmet_ns *ns = req->ns;
int ret;
ret = __blkdev_issue_discard(ns->bdev,
le64_to_cpu(range->slba) << (ns->blksize_shift - 9),
le32_to_cpu(range->nlb) << (ns->blksize_shift - 9),
GFP_KERNEL, 0, bio);
if (ret && ret != -EOPNOTSUPP)
return NVME_SC_INTERNAL | NVME_SC_DNR;
return 0;
if (ret)
req->error_slba = le64_to_cpu(range->slba);
return blk_to_nvme_status(req, errno_to_blk_status(ret));
}
static void nvmet_bdev_execute_discard(struct nvmet_req *req)
@ -163,7 +222,7 @@ static void nvmet_bdev_execute_discard(struct nvmet_req *req)
if (status)
break;
status = nvmet_bdev_discard_range(req->ns, &range, &bio);
status = nvmet_bdev_discard_range(req, &range, &bio);
if (status)
break;
}
@ -204,16 +263,16 @@ static void nvmet_bdev_execute_write_zeroes(struct nvmet_req *req)
u16 status = NVME_SC_SUCCESS;
sector_t sector;
sector_t nr_sector;
int ret;
sector = le64_to_cpu(write_zeroes->slba) <<
(req->ns->blksize_shift - 9);
nr_sector = (((sector_t)le16_to_cpu(write_zeroes->length) + 1) <<
(req->ns->blksize_shift - 9));
if (__blkdev_issue_zeroout(req->ns->bdev, sector, nr_sector,
GFP_KERNEL, &bio, 0))
status = NVME_SC_INTERNAL | NVME_SC_DNR;
ret = __blkdev_issue_zeroout(req->ns->bdev, sector, nr_sector,
GFP_KERNEL, &bio, 0);
status = blk_to_nvme_status(req, errno_to_blk_status(ret));
if (bio) {
bio->bi_private = req;
bio->bi_end_io = nvmet_bio_done;
@ -248,6 +307,7 @@ u16 nvmet_bdev_parse_io_cmd(struct nvmet_req *req)
default:
pr_err("unhandled cmd %d on qid %d\n", cmd->common.opcode,
req->sq->qid);
req->error_loc = offsetof(struct nvme_common_command, opcode);
return NVME_SC_INVALID_OPCODE | NVME_SC_DNR;
}
}