fabrics: filter out subsystems with non-matching application string

If the nvme root has an application string set any subsystem lookup
should ignore subsystems which either have no application string set
or which have a non-matching application string.

Signed-off-by: Hannes Reinecke <[email protected]>

Author: hreinecke

src/nvme/fabrics.c

@@ -819,6 +819,7 @@ int nvmf_add_ctrl(nvme_host_t h, nvme_ctrl_t c,
 		  const struct nvme_fabrics_config *cfg)
 {
 	nvme_subsystem_t s;
+	const char *root_app, *app;
 	char *argstr;
 	int ret;
 
@@ -855,6 +856,23 @@ int nvmf_add_ctrl(nvme_host_t h, nvme_ctrl_t c,
 
 	}
 
+	root_app = nvme_root_get_application(h->r);
+	app = nvme_subsystem_get_application(s);
+	if (root_app) {
+		/*
+		 * configuration is managed by an application,
+		 * refuse to act on subsystems which either have
+		 * no application set or which habe a different
+		 * application string.
+		 */
+		if (!app || strcmp(app, root_app)) {
+			nvme_msg(h->r, LOG_INFO, "skip %s, not managed by %s\n",
+				 nvme_subsystem_get_nqn(s), root_app);
+			errno = ENVME_CONNECT_INVAL;
+			return -1;
+		}
+	}
+
 	nvme_ctrl_set_discovered(c, true);
 	if (traddr_is_hostname(h->r, c)) {
 		char *traddr = c->traddr;

src/nvme/tree.c

@@ -466,6 +466,12 @@ struct nvme_subsystem *nvme_lookup_subsystem(struct nvme_host *h,
 		if (name && s->name &&
 		    strcmp(s->name, name))
 			continue;
+		if (h->r->application) {
+			if (!s->application)
+				continue;
+			if (strcmp(h->r->application, s->application))
+				continue;
+		}
 		return s;
 	}
 	return nvme_alloc_subsystem(h, name, subsysnqn);
@@ -572,6 +578,8 @@ static int nvme_init_subsystem(nvme_subsystem_t s, const char *name)
 	}
 	s->name = strdup(name);
 	s->sysfs_dir = (char *)path;
+	if (s->h->r->application)
+		s->application = strdup(s->h->r->application);
 
 	return 0;
 }