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path: root/drivers/nvme/host/multipath.c
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Diffstat (limited to 'drivers/nvme/host/multipath.c')
-rw-r--r--drivers/nvme/host/multipath.c46
1 files changed, 29 insertions, 17 deletions
diff --git a/drivers/nvme/host/multipath.c b/drivers/nvme/host/multipath.c
index da78e499947a..18d084ed497e 100644
--- a/drivers/nvme/host/multipath.c
+++ b/drivers/nvme/host/multipath.c
@@ -409,15 +409,14 @@ static void nvme_mpath_set_live(struct nvme_ns *ns)
{
struct nvme_ns_head *head = ns->head;
- lockdep_assert_held(&ns->head->lock);
-
if (!head->disk)
return;
- if (!(head->disk->flags & GENHD_FL_UP))
+ if (!test_and_set_bit(NVME_NSHEAD_DISK_LIVE, &head->flags))
device_add_disk(&head->subsys->dev, head->disk,
nvme_ns_id_attr_groups);
+ mutex_lock(&head->lock);
if (nvme_path_is_optimized(ns)) {
int node, srcu_idx;
@@ -426,9 +425,10 @@ static void nvme_mpath_set_live(struct nvme_ns *ns)
__nvme_find_path(head, node);
srcu_read_unlock(&head->srcu, srcu_idx);
}
+ mutex_unlock(&head->lock);
- synchronize_srcu(&ns->head->srcu);
- kblockd_schedule_work(&ns->head->requeue_work);
+ synchronize_srcu(&head->srcu);
+ kblockd_schedule_work(&head->requeue_work);
}
static int nvme_parse_ana_log(struct nvme_ctrl *ctrl, void *data,
@@ -483,14 +483,12 @@ static inline bool nvme_state_is_live(enum nvme_ana_state state)
static void nvme_update_ns_ana_state(struct nvme_ana_group_desc *desc,
struct nvme_ns *ns)
{
- mutex_lock(&ns->head->lock);
ns->ana_grpid = le32_to_cpu(desc->grpid);
ns->ana_state = desc->state;
clear_bit(NVME_NS_ANA_PENDING, &ns->flags);
if (nvme_state_is_live(ns->ana_state))
nvme_mpath_set_live(ns);
- mutex_unlock(&ns->head->lock);
}
static int nvme_update_ana_state(struct nvme_ctrl *ctrl,
@@ -640,31 +638,37 @@ static ssize_t ana_state_show(struct device *dev, struct device_attribute *attr,
}
DEVICE_ATTR_RO(ana_state);
-static int nvme_set_ns_ana_state(struct nvme_ctrl *ctrl,
+static int nvme_lookup_ana_group_desc(struct nvme_ctrl *ctrl,
struct nvme_ana_group_desc *desc, void *data)
{
- struct nvme_ns *ns = data;
+ struct nvme_ana_group_desc *dst = data;
- if (ns->ana_grpid == le32_to_cpu(desc->grpid)) {
- nvme_update_ns_ana_state(desc, ns);
- return -ENXIO; /* just break out of the loop */
- }
+ if (desc->grpid != dst->grpid)
+ return 0;
- return 0;
+ *dst = *desc;
+ return -ENXIO; /* just break out of the loop */
}
void nvme_mpath_add_disk(struct nvme_ns *ns, struct nvme_id_ns *id)
{
if (nvme_ctrl_use_ana(ns->ctrl)) {
+ struct nvme_ana_group_desc desc = {
+ .grpid = id->anagrpid,
+ .state = 0,
+ };
+
mutex_lock(&ns->ctrl->ana_lock);
ns->ana_grpid = le32_to_cpu(id->anagrpid);
- nvme_parse_ana_log(ns->ctrl, ns, nvme_set_ns_ana_state);
+ nvme_parse_ana_log(ns->ctrl, &desc, nvme_lookup_ana_group_desc);
mutex_unlock(&ns->ctrl->ana_lock);
+ if (desc.state) {
+ /* found the group desc: update */
+ nvme_update_ns_ana_state(&desc, ns);
+ }
} else {
- mutex_lock(&ns->head->lock);
ns->ana_state = NVME_ANA_OPTIMIZED;
nvme_mpath_set_live(ns);
- mutex_unlock(&ns->head->lock);
}
if (bdi_cap_stable_pages_required(ns->queue->backing_dev_info)) {
@@ -686,6 +690,14 @@ void nvme_mpath_remove_disk(struct nvme_ns_head *head)
kblockd_schedule_work(&head->requeue_work);
flush_work(&head->requeue_work);
blk_cleanup_queue(head->disk->queue);
+ if (!test_bit(NVME_NSHEAD_DISK_LIVE, &head->flags)) {
+ /*
+ * if device_add_disk wasn't called, prevent
+ * disk release to put a bogus reference on the
+ * request queue
+ */
+ head->disk->queue = NULL;
+ }
put_disk(head->disk);
}