libcephfs: add unmount function in cephfs.pyx

src/pybind/cephfs/cephfs.pyx

@@ -108,6 +108,7 @@ cdef extern from "cephfs/libcephfs.h" nogil:
     int ceph_conf_set(ceph_mount_info *cmount, const char *option, const char *value)
 
     int ceph_mount(ceph_mount_info *cmount, const char *root)
+    int ceph_unmount(ceph_mount_info *cmount)
     int ceph_fstat(ceph_mount_info *cmount, int fd, stat *stbuf)
     int ceph_stat(ceph_mount_info *cmount, const char *path, stat *stbuf)
     int ceph_statfs(ceph_mount_info *cmount, const char *path, statvfs *stbuf)
@@ -479,6 +480,14 @@ cdef class LibCephFS(object):
             raise make_ex(ret, "error calling ceph_mount")
         self.state = "mounted"
 
+    def unmount(self):
+        self.require_state("mounted")
+        with nogil:
+            ret = ceph_unmount(self.cluster)
+        if ret != 0:
+            raise make_ex(ret, "error calling ceph_unmount")
+        self.state = "initialized"
+
     def statfs(self, path):
         self.require_state("mounted")
         path = cstr(path, 'path')

src/test/pybind/test_cephfs.py

@@ -206,3 +206,10 @@ def test_flock():
     cephfs.close(fd2)
 
     cephfs.close(fd)
+
+@with_setup(setup_test)
+def test_mount_unmount():
+    test_directory()
+    cephfs.unmount()
+    cephfs.mount()
+    test_open()