nvme: create 'slaves' and 'holders' entries for hidden controllers
When creating nvme multipath devices we should populate the 'slaves' and
'holders' directorys properly to aid userspace topology detection.
Signed-off-by: Hannes Reinecke <hare@suse.com>
[hch: split from a larger patch, compile fix for CONFIG_NVME_MULTIPATH=n]
Reviewed-by: Keith Busch <keith.busch@intel.com>
Reviewed-by: Martin K. Petersen <martin.petersen@oracle.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
diff --git a/drivers/nvme/host/core.c b/drivers/nvme/host/core.c
index 438d3fa..c3182aa 100644
--- a/drivers/nvme/host/core.c
+++ b/drivers/nvme/host/core.c
@@ -2896,6 +2896,7 @@ static void nvme_alloc_ns(struct nvme_ctrl *ctrl, unsigned nsid)
if (new)
nvme_mpath_add_disk(ns->head);
+ nvme_mpath_add_disk_links(ns);
return;
out_unlink_ns:
mutex_lock(&ctrl->subsys->lock);
@@ -2919,6 +2920,7 @@ static void nvme_ns_remove(struct nvme_ns *ns)
if (ns->disk && ns->disk->flags & GENHD_FL_UP) {
if (blk_get_integrity(ns->disk))
blk_integrity_unregister(ns->disk);
+ nvme_mpath_remove_disk_links(ns);
sysfs_remove_group(&disk_to_dev(ns->disk)->kobj,
&nvme_ns_id_attr_group);
if (ns->ndev)
diff --git a/drivers/nvme/host/multipath.c b/drivers/nvme/host/multipath.c
index 8502758..78d9215 100644
--- a/drivers/nvme/host/multipath.c
+++ b/drivers/nvme/host/multipath.c
@@ -245,6 +245,25 @@ void nvme_mpath_add_disk(struct nvme_ns_head *head)
head->disk->disk_name);
}
+void nvme_mpath_add_disk_links(struct nvme_ns *ns)
+{
+ struct kobject *slave_disk_kobj, *holder_disk_kobj;
+
+ if (!ns->head->disk)
+ return;
+
+ slave_disk_kobj = &disk_to_dev(ns->disk)->kobj;
+ if (sysfs_create_link(ns->head->disk->slave_dir, slave_disk_kobj,
+ kobject_name(slave_disk_kobj)))
+ return;
+
+ holder_disk_kobj = &disk_to_dev(ns->head->disk)->kobj;
+ if (sysfs_create_link(ns->disk->part0.holder_dir, holder_disk_kobj,
+ kobject_name(holder_disk_kobj)))
+ sysfs_remove_link(ns->head->disk->slave_dir,
+ kobject_name(slave_disk_kobj));
+}
+
void nvme_mpath_remove_disk(struct nvme_ns_head *head)
{
if (!head->disk)
@@ -259,3 +278,14 @@ void nvme_mpath_remove_disk(struct nvme_ns_head *head)
blk_cleanup_queue(head->disk->queue);
put_disk(head->disk);
}
+
+void nvme_mpath_remove_disk_links(struct nvme_ns *ns)
+{
+ if (!ns->head->disk)
+ return;
+
+ sysfs_remove_link(ns->disk->part0.holder_dir,
+ kobject_name(&disk_to_dev(ns->head->disk)->kobj));
+ sysfs_remove_link(ns->head->disk->slave_dir,
+ kobject_name(&disk_to_dev(ns->disk)->kobj));
+}
diff --git a/drivers/nvme/host/nvme.h b/drivers/nvme/host/nvme.h
index 895a433..c0873a6 100644
--- a/drivers/nvme/host/nvme.h
+++ b/drivers/nvme/host/nvme.h
@@ -405,7 +405,9 @@ bool nvme_req_needs_failover(struct request *req);
void nvme_kick_requeue_lists(struct nvme_ctrl *ctrl);
int nvme_mpath_alloc_disk(struct nvme_ctrl *ctrl,struct nvme_ns_head *head);
void nvme_mpath_add_disk(struct nvme_ns_head *head);
+void nvme_mpath_add_disk_links(struct nvme_ns *ns);
void nvme_mpath_remove_disk(struct nvme_ns_head *head);
+void nvme_mpath_remove_disk_links(struct nvme_ns *ns);
static inline void nvme_mpath_clear_current_path(struct nvme_ns *ns)
{
@@ -437,6 +439,12 @@ static inline void nvme_mpath_add_disk(struct nvme_ns_head *head)
static inline void nvme_mpath_remove_disk(struct nvme_ns_head *head)
{
}
+static inline void nvme_mpath_add_disk_links(struct nvme_ns *ns)
+{
+}
+static inline void nvme_mpath_remove_disk_links(struct nvme_ns *ns)
+{
+}
static inline void nvme_mpath_clear_current_path(struct nvme_ns *ns)
{
}