File 0005-drbd-Proper-locking-around-new_current_uui... of Package drbd

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File 0005-drbd-Proper-locking-around-new_current_uuid-on-a-dis.patch of Package drbd

From c7384276634be7c5b49ef0b8d7fa064927a207f8 Mon Sep 17 00:00:00 2001
From: Philipp Reisner <philipp.reisner@linbit.com>
Date: Wed, 14 Aug 2024 19:42:40 +0200
Subject: [PATCH 05/32] drbd: Proper locking around new_current_uuid on a
 diskless

Like the current UUID of a diskful node, changing the exposed_uuid of
a diskless node needs to be serialized with the UUID exchange when
establishing new connections.
---
 drbd/drbd_main.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drbd/drbd_main.c b/drbd/drbd_main.c
index bc3283b045c9..2792b9896271 100644
--- a/drbd/drbd_main.c
+++ b/drbd/drbd_main.c
@@ -4827,7 +4827,10 @@ void drbd_uuid_new_current(struct drbd_device *device, bool forced)
 			current_uuid |= UUID_PRIMARY;
 		else
 			current_uuid &= ~UUID_PRIMARY;
+
+		down_write(&device->uuid_sem);
 		drbd_uuid_set_exposed(device, current_uuid, false);
+		downgrade_write(&device->uuid_sem);
 		drbd_info(device, "sending new current UUID: %016llX\n", current_uuid);
 
 		weak_nodes = drbd_weak_nodes_device(device);
@@ -4837,6 +4840,7 @@ void drbd_uuid_new_current(struct drbd_device *device, bool forced)
 				peer_device->current_uuid = current_uuid;
 			}
 		}
+		up_read(&device->uuid_sem);
 	}
 }
 
-- 
2.35.3

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