Merge PR ceph#62406 into main

* refs/pull/62406/head:
	client: process path without inode anchor
	test/client: add ll_walk test with cwd and root path

Reviewed-by: Dhairya Parmar <[email protected]>

Author: batrick

src/client/Client.cc

@@ -13453,18 +13453,15 @@ int Client::ll_walk(const char* name, Inode **out, struct ceph_statx *stx,
   if (!mref_reader.is_state_satisfied())
     return -ENOTCONN;
 
-  filepath fp(name, 0);
   InodeRef in;
-  int rc;
   unsigned mask = statx_to_mask(flags, want);
 
   ldout(cct, 3) << __func__ << " " << name << dendl;
   tout(cct) << __func__ << std::endl;
   tout(cct) << name << std::endl;
 
   std::scoped_lock lock(client_lock);
-  rc = path_walk(cwd, fp, &in, perms, {.followsym = !(flags & AT_SYMLINK_NOFOLLOW), .mask = mask});
-  if (rc < 0) {
+  if (int rc = path_walk(cwd, filepath(name), &in, perms, {.followsym = !(flags & AT_SYMLINK_NOFOLLOW), .mask = mask}); rc < 0) {
     /* zero out mask, just in case... */
     stx->stx_mask = 0;
     stx->stx_ino = 0;

src/test/client/CMakeLists.txt

@@ -2,6 +2,7 @@ if(${WITH_CEPHFS})
   add_executable(ceph_test_client
     main.cc
     alternate_name.cc
+    ll_api.cc
     ops.cc
     nonblocking.cc
     commands.cc

src/test/client/ll_api.cc

@@ -0,0 +1,38 @@
+// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
+// vim: ts=8 sw=2 smarttab
+/*
+ * Ceph - scalable distributed file system
+ *
+ * Copyright (C) 2025 IBM, Inc.
+ *
+ * This is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License version 2.1, as published by the Free Software
+ * Foundation.  See file COPYING.
+ *
+ */
+
+#include <errno.h>
+
+#include <iostream>
+#include <string>
+
+#include <fmt/format.h>
+
+#include "test/client/TestClient.h"
+
+TEST_F(TestClient, LL_Walk) {
+  auto dir = fmt::format("/{}_{}", ::testing::UnitTest::GetInstance()->current_test_info()->name(), getpid());
+  ASSERT_EQ(0, client->mkdir(dir.c_str(), 0777, myperm));
+
+  ASSERT_EQ(0, client->chdir(dir.c_str(), myperm));
+  std::string cwd;
+  ASSERT_EQ(0, client->getcwd(cwd, myperm));
+  ASSERT_STREQ(cwd.c_str(), dir.c_str());
+
+  Inode* in = nullptr;
+  struct ceph_statx xbuf;
+  ASSERT_EQ(0, client->ll_walk(dir.c_str(), &in, &xbuf, 0, 0, myperm));
+
+  ASSERT_EQ(0, client->rmdir(dir.c_str(), myperm));
+}