From 2c2785b6969959d7358ca29ee38e8078fa887ff1 Mon Sep 17 00:00:00 2001
From: sajibreadd <sajibreadd@gmail.com>
Date: Mon, 11 Aug 2025 10:46:39 +0200
Subject: [PATCH] Test failure: LibCephFS.SnapdiffDeletionRecreation
 Reproduces: https://tracker.ceph.com/issues/72518 Signed-off-by: Md Mahamudur
 Rahaman Sajib <mahamudur.sajib@croit.io>

(cherry picked from commit 4ff71386ac1529dc1f7c2640511f509bd6842862)
(cherry picked from commit 48f5a5d04fb2cef52c5e4a3daf452ccf988666d2)
---
 src/test/libcephfs/snapdiff.cc | 54 ++++++++++++++++++++++++++++++++++
 1 file changed, 54 insertions(+)

diff --git a/src/test/libcephfs/snapdiff.cc b/src/test/libcephfs/snapdiff.cc
index 2320bf58b6c..9b8c99f1eef 100644
--- a/src/test/libcephfs/snapdiff.cc
+++ b/src/test/libcephfs/snapdiff.cc
@@ -27,6 +27,7 @@
 #include <algorithm>
 #include <limits.h>
 #include <dirent.h>
+#include <random>
 
 using namespace std;
 class TestMount {
@@ -1682,3 +1683,56 @@ TEST(LibCephFS, HugeSnapDiffLargeDelta)
   ASSERT_EQ(0, test_mount.rmsnap("snap1"));
   ASSERT_EQ(0, test_mount.rmsnap("snap2"));
 }
+TEST(LibCephFS, SnapdiffDeletionRecreation) {
+  size_t bulk_count = 1 << 12;
+  TestMount test_mount("/SnapdiffDeletionRecreation");
+
+  ASSERT_EQ(0, test_mount.mkdir("bulk"));
+  ASSERT_EQ(0, test_mount.mkdir("test"));
+
+  int i, j;
+  char path[PATH_MAX];
+  for (i = 0; i < bulk_count; i++) {
+    snprintf(path, PATH_MAX - 1, "bulk/%d", i);
+    test_mount.write_full(path, path);
+  }
+  ASSERT_EQ(0, test_mount.mksnap("snap1"));
+  // creation of snap1 done
+
+  for (i = 0; i < bulk_count / 2; ++i) {
+    snprintf(path, PATH_MAX - 1, "bulk/%d", i);
+    ASSERT_EQ(0, test_mount.unlink(path));
+    if (i >= bulk_count / 4) {
+      ASSERT_EQ(0, test_mount.mkdir(path));
+    }
+  }
+  for (i = bulk_count; i < 2 * bulk_count; ++i) {
+    snprintf(path, PATH_MAX - 1, "bulk/%d", i);
+    test_mount.write_full(path, path);
+  }
+  ASSERT_EQ(0, test_mount.mksnap("snap2"));
+
+  uint64_t snapid1;
+  uint64_t snapid2;
+
+  // learn snapshot ids and do basic verification
+  ASSERT_EQ(0, test_mount.get_snapid("snap1", &snapid1));
+  ASSERT_EQ(0, test_mount.get_snapid("snap2", &snapid2));
+
+  vector <pair <string, uint64_t>> expected;
+  for (int i = 0; i < 2 * bulk_count; ++i) {
+    string dir = to_string(i);
+    if (i < bulk_count / 4) {
+      expected.push_back({dir, snapid1});
+    } else if (i >= bulk_count / 4 && i < bulk_count / 2) {
+      expected.push_back({dir, snapid1});
+      expected.push_back({dir, snapid2});
+    } else if (i >= bulk_count) {
+      expected.push_back({dir, snapid2});
+    }
+  }
+  test_mount.verify_snap_diff(expected, "bulk", "snap1", "snap2");
+
+  test_mount.rmsnap("snap1");
+  test_mount.rmsnap("snap2");
+}
-- 
2.39.5