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nvmet: fix mar and mor off-by-one errors 

Maximum Active Resources (MAR) and Maximum Open Resources (MOR) are 0's
based vales where a value of 0xffffffff indicates that there is no limit.

Decrement the values that are returned by bdev_max_open_zones and
bdev_max_active_zones as the block layer helpers are not 0's based.
A 0 returned by the block layer helpers indicates no limit, thus convert
it to 0xffffffff (U32_MAX).

Fixes: aaf2e048af ("nvmet: add ZBD over ZNS backend support")
Suggested-by: Niklas Cassel <niklas.cassel@wdc.com>
Signed-off-by: Dennis Maisenbacher <dennis.maisenbacher@wdc.com>
Reviewed-by: Chaitanya Kulkarni <kch@nvidia.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
This commit is contained in:
Dennis Maisenbacher 2022-09-06 09:39:28 +02:00 committed by Christoph Hellwig
parent 3770a42bb8
commit b7e97872a6
1 changed files with 15 additions and 2 deletions
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17
drivers/nvme/target/zns.c
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@ -100,6 +100,7 @@ void nvmet_execute_identify_cns_cs_ns(struct nvmet_req *req)
struct nvme_id_ns_zns *id_zns;
u64 zsze;
u16 status;
u32 mar, mor;
if (le32_to_cpu(req->cmd->identify.nsid) == NVME_NSID_ALL) {
req->error_loc = offsetof(struct nvme_identify, nsid);
@ -130,8 +131,20 @@ void nvmet_execute_identify_cns_cs_ns(struct nvmet_req *req)
zsze = (bdev_zone_sectors(req->ns->bdev) << 9) >>
req->ns->blksize_shift;
id_zns->lbafe[0].zsze = cpu_to_le64(zsze);
id_zns->mor = cpu_to_le32(bdev_max_open_zones(req->ns->bdev));
id_zns->mar = cpu_to_le32(bdev_max_active_zones(req->ns->bdev));
mor = bdev_max_open_zones(req->ns->bdev);
if (!mor)
mor = U32_MAX;
else
mor--;
id_zns->mor = cpu_to_le32(mor);
mar = bdev_max_active_zones(req->ns->bdev);
if (!mar)
mar = U32_MAX;
else
mar--;
id_zns->mar = cpu_to_le32(mar);
done:
status = nvmet_copy_to_sgl(req, 0, id_zns, sizeof(*id_zns));