nvme: make sure ns head inherits underlying device limits

Whenever we update ns_head info, we need to make sure it is still
compatible with all underlying backing devices because although nvme
multipath doesn't have any explicit use of these limits, other devices
can still be stacked on top of it which may rely on the underlying limits.
Start with unlimited stacking limits, and every info update iterate over
siblings and adjust queue limits.

Signed-off-by: Sagi Grimberg <sagi@grimberg.me>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Jens Axboe <axboe@kernel.dk>

2 files changed, 4 insertions, 1 deletions

diff --git a/drivers/nvme/host/core.c b/drivers/nvme/host/core.c
index 2e65be8b1387..559d567693b8 100644
--- a/drivers/nvme/host/core.c
+++ b/drivers/nvme/host/core.c
@@ -1519,8 +1519,10 @@ static void __nvme_revalidate_disk(struct gendisk *disk, struct nvme_id_ns *id)
         if (ns->ndev)
                 nvme_nvm_update_nvm_info(ns);
 #ifdef CONFIG_NVME_MULTIPATH
-        if (ns->head->disk)
+        if (ns->head->disk) {
                 nvme_update_disk_info(ns->head->disk, ns, id);
+                blk_queue_stack_limits(ns->head->disk->queue, ns->queue);
+        }
 #endif
 }
 
diff --git a/drivers/nvme/host/multipath.c b/drivers/nvme/host/multipath.c
index 5e3cc8c59a39..9901afd804ce 100644
--- a/drivers/nvme/host/multipath.c
+++ b/drivers/nvme/host/multipath.c
@@ -285,6 +285,7 @@ int nvme_mpath_alloc_disk(struct nvme_ctrl *ctrl, struct nvme_ns_head *head)
         blk_queue_flag_set(QUEUE_FLAG_NONROT, q);
         /* set to a default value for 512 until disk is validated */
         blk_queue_logical_block_size(q, 512);
+        blk_set_stacking_limits(&q->limits);
 
         /* we need to propagate up the VMC settings */
         if (ctrl->vwc & NVME_CTRL_VWC_PRESENT)