40 lines
1.2 KiB
Diff
40 lines
1.2 KiB
Diff
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From c7384276634be7c5b49ef0b8d7fa064927a207f8 Mon Sep 17 00:00:00 2001
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From: Philipp Reisner <philipp.reisner@linbit.com>
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Date: Wed, 14 Aug 2024 19:42:40 +0200
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Subject: [PATCH 05/32] drbd: Proper locking around new_current_uuid on a
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diskless
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Like the current UUID of a diskful node, changing the exposed_uuid of
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a diskless node needs to be serialized with the UUID exchange when
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establishing new connections.
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---
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drbd/drbd_main.c | 4 ++++
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1 file changed, 4 insertions(+)
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diff --git a/drbd/drbd_main.c b/drbd/drbd_main.c
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index bc3283b045c9..2792b9896271 100644
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--- a/drbd/drbd_main.c
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+++ b/drbd/drbd_main.c
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@@ -4827,7 +4827,10 @@ void drbd_uuid_new_current(struct drbd_device *device, bool forced)
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current_uuid |= UUID_PRIMARY;
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else
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current_uuid &= ~UUID_PRIMARY;
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+
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+ down_write(&device->uuid_sem);
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drbd_uuid_set_exposed(device, current_uuid, false);
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+ downgrade_write(&device->uuid_sem);
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drbd_info(device, "sending new current UUID: %016llX\n", current_uuid);
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weak_nodes = drbd_weak_nodes_device(device);
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@@ -4837,6 +4840,7 @@ void drbd_uuid_new_current(struct drbd_device *device, bool forced)
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peer_device->current_uuid = current_uuid;
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}
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}
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+ up_read(&device->uuid_sem);
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}
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}
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--
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2.35.3
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