test: add a link count test

...and use the lowlevel calls to emulate what ganesha would do. In
particular, it dumps its inode from the cache after an unlink. So
do a second lookup afterward and verify that the nlink field in the
struct stat is valid.

Signed-off-by: Jeff Layton <jlayton@redhat.com>

diff --git a/src/test/libcephfs/test.cc b/src/test/libcephfs/test.cc
index efb3a88555ed3b878cc510fe7d29b3e2658d112e..2bf7ec1357e0a364384d1a67622efe98e11e6b06 100644 (file)
--- a/src/test/libcephfs/test.cc
+++ b/src/test/libcephfs/test.cc
@@ -1374,3 +1374,37 @@ TEST(LibCephFS, OpenNoClose) {
   // shutdown should force close opened file/dir
   ceph_shutdown(cmount);
 }
+
+TEST(LibCephFS, Nlink) {
+  struct ceph_mount_info *cmount;
+  ASSERT_EQ(ceph_create(&cmount, NULL), 0);
+  ASSERT_EQ(ceph_conf_read_file(cmount, NULL), 0);
+  ASSERT_EQ(0, ceph_conf_parse_env(cmount, NULL));
+  ASSERT_EQ(ceph_mount(cmount, "/"), 0);
+
+  Inode *root, *dir, *file;
+
+  ASSERT_EQ(ceph_ll_lookup_root(cmount, &root), 0);
+
+  char dirname[32], filename[32], linkname[32];
+  sprintf(dirname, "nlinkdir%x", getpid());
+  sprintf(filename, "nlinkorig%x", getpid());
+  sprintf(linkname, "nlinklink%x", getpid());
+
+  struct stat  st;
+  Fh *fh;
+
+  ASSERT_EQ(ceph_ll_mkdir(cmount, root, dirname, 0755, &st, &dir, getuid(), getgid()), 0);
+  ASSERT_EQ(ceph_ll_create(cmount, dir, filename, 0666, O_RDWR|O_CREAT|O_EXCL,
+                          &st, &file, &fh, getuid(), getgid()), 0);
+  ASSERT_EQ(st.st_nlink, (nlink_t)1);
+
+  ASSERT_EQ(ceph_ll_link(cmount, file, dir, linkname, &st, getuid(), getgid()), 0);
+  ASSERT_EQ(st.st_nlink, (nlink_t)2);
+
+  ASSERT_EQ(ceph_ll_unlink(cmount, dir, linkname, getuid(), getgid()), 0);
+  ASSERT_EQ(ceph_ll_lookup(cmount, dir, filename, &st, &file, getuid(), getgid()), 0);
+  ASSERT_EQ(st.st_nlink, (nlink_t)1);
+
+  ceph_shutdown(cmount);
+}