From: Dennis Maisenbacher <dennis.maisenbacher@xxxxxxx>
[ Upstream commit b7e97872a65e1d57b4451769610554c131f37a0a ]
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: aaf2e048af27 ("nvmet: add ZBD over ZNS backend support")
Suggested-by: Niklas Cassel <niklas.cassel@xxxxxxx>
Signed-off-by: Dennis Maisenbacher <dennis.maisenbacher@xxxxxxx>
Reviewed-by: Chaitanya Kulkarni <kch@xxxxxxxxxx>
Signed-off-by: Christoph Hellwig <hch@xxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
drivers/nvme/target/zns.c | 17 +++++++++++++++--
1 file changed, 15 insertions(+), 2 deletions(-)
diff --git a/drivers/nvme/target/zns.c b/drivers/nvme/target/zns.c
index 235553337fb2d..1466698751c55 100644
--- a/drivers/nvme/target/zns.c
+++ b/drivers/nvme/target/zns.c
@@ -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);
@@ -126,8 +127,20 @@ 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));
--
2.35.1
