File 0018-tree-make-nvme_ctrl_scan_namespace-idempotent.patch of Package libnvme.27116

From: Hannes Reinecke <hare@suse.de>
Date: Fri, 10 Jun 2022 10:19:01 +0200
Subject: tree: make nvme_ctrl_scan_namespace() idempotent
Git-commit: 939345572149559240119c8d0fc97f5e3e906538
References: git-fixes

When issuing a rescan the list of namespaces is not cleared, so
just blindly adding new entries might not yield the expected result.
This patch clears out old entries from the controller namespace list
before adding new ones, ensuring that we only ever have one namespace
with a given name in the list of controller namespaces.

Signed-off-by: Hannes Reinecke <hare@suse.de>
Acked-by: Daniel Wagner <dwagner@suse.de>
---
 src/nvme/tree.c |    8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

--- a/src/nvme/tree.c
+++ b/src/nvme/tree.c
@@ -1860,7 +1860,7 @@ nvme_ns_t nvme_scan_namespace(const char
 static int nvme_ctrl_scan_namespace(nvme_root_t r, struct nvme_ctrl *c,
 				    char *name)
 {
-	struct nvme_ns *n;
+	struct nvme_ns *n, *_n, *__n;
 
 	nvme_msg(r, LOG_DEBUG, "scan controller %s namespace %s\n",
 		 c->name, name);
@@ -1874,7 +1874,11 @@ static int nvme_ctrl_scan_namespace(nvme
 		nvme_msg(r, LOG_DEBUG, "failed to scan namespace %s\n", name);
 		return -1;
 	}
-
+	nvme_ctrl_for_each_ns_safe(c, _n, __n) {
+		if (strcmp(n->name, _n->name))
+			continue;
+		__nvme_free_ns(_n);
+	}
 	n->s = c->s;
 	n->c = c;
 	list_add(&c->namespaces, &n->entry);