From a1e2621621a494f927f7474de443c7adc98adf65 Mon Sep 17 00:00:00 2001
From: Patrick Donnelly <pdonnell@ibm.com>
Date: Wed, 19 Feb 2025 15:28:46 -0500
Subject: [PATCH] test/libcephfs: test parallel creates

That the cap_shared_gen value does not result in unexpected ENOENT.

Signed-off-by: Patrick Donnelly <pdonnell@ibm.com>
(cherry picked from commit aaaa04264a02e6e89ca5721cad048c41ad3e1111)
---
 src/test/libcephfs/test.cc | 103 +++++++++++++++++++++++++++++++++++++
 1 file changed, 103 insertions(+)

diff --git a/src/test/libcephfs/test.cc b/src/test/libcephfs/test.cc
index 1ee3e49e151..e049e6ba604 100644
--- a/src/test/libcephfs/test.cc
+++ b/src/test/libcephfs/test.cc
@@ -2145,6 +2145,109 @@ TEST(LibCephFS, ShutdownRace)
 }
 #endif
 
+
+TEST(LibCephFS, CreateParallel)
+{
+  char fname[4096] = "dir/file_parallel";
+  std::mutex lock; // for memory barrier
+  std::array<int, 256> fds;
+  std::array<std::thread, fds.size()> threads;
+  std::fill(fds.begin(), fds.end(), -1);
+
+  struct ceph_mount_info *cmount;
+  ASSERT_EQ(0, ceph_create(&cmount, NULL));
+  ASSERT_EQ(0, ceph_conf_read_file(cmount, NULL));
+  ASSERT_EQ(0, ceph_conf_parse_env(cmount, NULL));
+  ASSERT_EQ(0, ceph_mount(cmount, "/"));
+
+  ASSERT_EQ(0, ceph_mkdirs(cmount, "dir/dummy", 0777));
+
+  ASSERT_EQ(0, ceph_unmount(cmount));
+  ASSERT_EQ(0, ceph_mount(cmount, "/"));
+
+  {
+    struct stat buf;
+    ASSERT_EQ(0, ceph_stat(cmount, "dir", &buf));
+  }
+
+  for (size_t i = 0; i < fds.size(); ++i) {
+    auto l = [cmount,&fname,&fds,&lock](int i) {
+      int fd = ceph_open(cmount, fname, O_CREAT|O_WRONLY, 0777);
+      std::lock_guard locker(lock);
+      fds[i] = fd;
+    };
+    threads[i] = std::thread(std::move(l), i);
+  }
+
+  for (size_t i = 0; i < fds.size(); ++i) {
+    threads[i].join();
+  }
+  std::lock_guard locker(lock);
+  for (size_t i = 0; i < fds.size(); ++i) {
+    ASSERT_GE(fds[i], 0);
+  }
+
+  ASSERT_EQ(0, ceph_unlink(cmount, fname));
+  ASSERT_EQ(0, ceph_rmdir(cmount, "dir/dummy"));
+  ASSERT_EQ(0, ceph_rmdir(cmount, "dir"));
+
+  ceph_shutdown(cmount);
+}
+
+TEST(LibCephFS, CreateExclParallel)
+{
+  char fname[4096] = "dir/file_parallel";
+  std::mutex lock; // for memory barrier
+  std::array<int, 256> fds;
+  std::array<std::thread, fds.size()> threads;
+  std::fill(fds.begin(), fds.end(), -1);
+
+  struct ceph_mount_info *cmount;
+  ASSERT_EQ(0, ceph_create(&cmount, NULL));
+  ASSERT_EQ(0, ceph_conf_read_file(cmount, NULL));
+  ASSERT_EQ(0, ceph_conf_parse_env(cmount, NULL));
+  ASSERT_EQ(0, ceph_mount(cmount, "/"));
+
+  ASSERT_EQ(0, ceph_mkdirs(cmount, "dir/dummy", 0777));
+
+  ASSERT_EQ(0, ceph_unmount(cmount));
+  ASSERT_EQ(0, ceph_mount(cmount, "/"));
+
+  {
+    struct stat buf;
+    ASSERT_EQ(0, ceph_stat(cmount, "dir", &buf));
+  }
+
+  for (size_t i = 0; i < fds.size(); ++i) {
+    auto l = [cmount,&fname,&fds,&lock](int i) {
+      int fd = ceph_open(cmount, fname, O_CREAT|O_EXCL|O_WRONLY, 0777);
+      std::lock_guard locker(lock);
+      fds[i] = fd;
+    };
+    threads[i] = std::thread(std::move(l), i);
+  }
+
+  for (size_t i = 0; i < fds.size(); ++i) {
+    threads[i].join();
+  }
+  std::lock_guard locker(lock);
+  int found = -1;
+  for (size_t i = 0; i < fds.size(); ++i) {
+    if (fds[i] >= 0) {
+      ASSERT_EQ(found, -1);
+      found = i;
+    } else {
+      ASSERT_EQ(fds[i], -EEXIST);
+    }
+  }
+
+  ASSERT_EQ(0, ceph_unlink(cmount, fname));
+  ASSERT_EQ(0, ceph_rmdir(cmount, "dir/dummy"));
+  ASSERT_EQ(0, ceph_rmdir(cmount, "dir"));
+
+  ceph_shutdown(cmount);
+}
+
 static void get_current_time_utimbuf(struct utimbuf *utb)
 {
   utime_t t = ceph_clock_now();
-- 
2.39.5