diff options
Diffstat (limited to 'drivers/nvme/host/multipath.c')
| -rw-r--r-- | drivers/nvme/host/multipath.c | 27 |
1 files changed, 27 insertions, 0 deletions
diff --git a/drivers/nvme/host/multipath.c b/drivers/nvme/host/multipath.c index 7c89c8da46d6..b47e01942ca4 100644 --- a/drivers/nvme/host/multipath.c +++ b/drivers/nvme/host/multipath.c @@ -976,6 +976,33 @@ static ssize_t ana_state_show(struct device *dev, struct device_attribute *attr, } DEVICE_ATTR_RO(ana_state); +static ssize_t numa_nodes_show(struct device *dev, struct device_attribute *attr, + char *buf) +{ + int node, srcu_idx; + nodemask_t numa_nodes; + struct nvme_ns *current_ns; + struct nvme_ns *ns = nvme_get_ns_from_dev(dev); + struct nvme_ns_head *head = ns->head; + + if (head->subsys->iopolicy != NVME_IOPOLICY_NUMA) + return 0; + + nodes_clear(numa_nodes); + + srcu_idx = srcu_read_lock(&head->srcu); + for_each_node(node) { + current_ns = srcu_dereference(head->current_path[node], + &head->srcu); + if (ns == current_ns) + node_set(node, numa_nodes); + } + srcu_read_unlock(&head->srcu, srcu_idx); + + return sysfs_emit(buf, "%*pbl\n", nodemask_pr_args(&numa_nodes)); +} +DEVICE_ATTR_RO(numa_nodes); + static int nvme_lookup_ana_group_desc(struct nvme_ctrl *ctrl, struct nvme_ana_group_desc *desc, void *data) { |