From: Hannes Reinecke <hare@suse.de>
Date: Mon, 18 Oct 2021 17:21:38 +0200
Subject: nvmet: register discovery subsystem as 'current'
Patch-mainline: v5.16-rc1
Git-commit: 2953b30b1d9feb1bc555682e64e6479d197b9231
References: bsc#1192761

Register the discovery subsystem as the 'current' discovery subsystem,
and add a new discovery log page entry for it.

Signed-off-by: Hannes Reinecke <hare@suse.de>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Acked-by: Daniel Wagner <dwagner@suse.de>
---
 drivers/nvme/target/core.c      |    1 +
 drivers/nvme/target/discovery.c |   17 +++++++++++------
 2 files changed, 12 insertions(+), 6 deletions(-)

--- a/drivers/nvme/target/core.c
+++ b/drivers/nvme/target/core.c
@@ -1507,6 +1507,7 @@ struct nvmet_subsys *nvmet_subsys_alloc(
 		subsys->max_qid = NVMET_NR_QUEUES;
 		break;
 	case NVME_NQN_DISC:
+	case NVME_NQN_CURR:
 		subsys->max_qid = 0;
 		break;
 	default:
--- a/drivers/nvme/target/discovery.c
+++ b/drivers/nvme/target/discovery.c
@@ -145,7 +145,7 @@ static size_t discovery_log_entries(stru
 	struct nvmet_ctrl *ctrl = req->sq->ctrl;
 	struct nvmet_subsys_link *p;
 	struct nvmet_port *r;
-	size_t entries = 0;
+	size_t entries = 1;
 
 	list_for_each_entry(p, &req->port->subsystems, entry) {
 		if (!nvmet_host_allowed(p->subsys, ctrl->hostnqn))
@@ -170,6 +170,7 @@ static void nvmet_execute_disc_get_log_p
 	u32 numrec = 0;
 	u16 status = 0;
 	void *buffer;
+	char traddr[NVMF_TRADDR_SIZE];
 
 	if (!nvmet_check_transfer_len(req, data_len))
 		return;
@@ -200,15 +201,19 @@ static void nvmet_execute_disc_get_log_p
 		status = NVME_SC_INTERNAL;
 		goto out;
 	}
-
 	hdr = buffer;
-	list_for_each_entry(p, &req->port->subsystems, entry) {
-		char traddr[NVMF_TRADDR_SIZE];
 
+	nvmet_set_disc_traddr(req, req->port, traddr);
+
+	nvmet_format_discovery_entry(hdr, req->port,
+				     nvmet_disc_subsys->subsysnqn,
+				     traddr, NVME_NQN_CURR, numrec);
+	numrec++;
+
+	list_for_each_entry(p, &req->port->subsystems, entry) {
 		if (!nvmet_host_allowed(p->subsys, ctrl->hostnqn))
 			continue;
 
-		nvmet_set_disc_traddr(req, req->port, traddr);
 		nvmet_format_discovery_entry(hdr, req->port,
 				p->subsys->subsysnqn, traddr,
 				NVME_NQN_NVME, numrec);
@@ -388,7 +393,7 @@ u16 nvmet_parse_discovery_cmd(struct nvm
 int __init nvmet_init_discovery(void)
 {
 	nvmet_disc_subsys =
-		nvmet_subsys_alloc(NVME_DISC_SUBSYS_NAME, NVME_NQN_DISC);
+		nvmet_subsys_alloc(NVME_DISC_SUBSYS_NAME, NVME_NQN_CURR);
 	return PTR_ERR_OR_ZERO(nvmet_disc_subsys);
 }