From 711425cc4757a325c5e496f4e9843b351605fccc Mon Sep 17 00:00:00 2001
From: Joonas Koivunen <joonas@neon.tech>
Date: Fri, 1 Dec 2023 18:30:51 +0200
Subject: [PATCH] fix: use create_new instead of create for mutex file (#6012)

Using create_new makes the uninit marker work as a mutual exclusion
primitive. Temporary hopefully.
---
 pageserver/src/tenant.rs | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/pageserver/src/tenant.rs b/pageserver/src/tenant.rs
index 12610b1c89..422cb671fe 100644
--- a/pageserver/src/tenant.rs
+++ b/pageserver/src/tenant.rs
@@ -3239,7 +3239,10 @@ impl Tenant {
         let uninit_mark_path = self
             .conf
             .timeline_uninit_mark_file_path(tenant_shard_id, timeline_id);
-        fs::File::create(&uninit_mark_path)
+        fs::OpenOptions::new()
+            .write(true)
+            .create_new(true)
+            .open(&uninit_mark_path)
             .context("Failed to create uninit mark file")
             .and_then(|_| {
                 crashsafe::fsync_file_and_parent(&uninit_mark_path)