ceph-fuse: create finisher threads after fork()

The ObjectCacher and MonClient classes both instantiate Finisher
threads.  We need to make sure they are created *after* the fork(2)
or else the process will fail to join() them on shutdown, and the
threads will not exist while fuse is doing useful work.

Put CephFuse on the heap and move all this initalization into the child
block, and make sure errors are passed back to the parent.

Fix-proposed-by: Alexandre Marangone <alexandre.maragone@inktank.com>
Signed-off-by: Sage Weil <sage@inktank.com>

1 files changed, 29 insertions, 24 deletions

diff --git a/src/ceph_fuse.cc b/src/ceph_fuse.cc
index 09aadb4c761..226330d3e6f 100644
--- a/src/ceph_fuse.cc
+++ b/src/ceph_fuse.cc
@@ -81,29 +81,6 @@ int main(int argc, const char **argv, const char *envp[]) {
     cerr << std::endl;
   }
 
-  // get monmap
-  MonClient mc(g_ceph_context);
-  int ret = mc.build_initial_monmap();
-  if (ret == -EINVAL)
-    usage();
-
-  if (ret < 0)
-    return -1;
-
-  // start up network
-  Messenger *messenger = Messenger::create(g_ceph_context,
-					   entity_name_t::CLIENT(), "client",
-					   getpid());
-  Client *client = new Client(messenger, &mc);
-
-  messenger->set_default_policy(Messenger::Policy::lossy_client(0, 0));
-  messenger->set_policy(entity_name_t::TYPE_MDS,
-			Messenger::Policy::lossless_client(0, 0));
-
-  if (filer_flags) {
-    client->set_filer_flags(filer_flags);
-  }
-
   // we need to handle the forking ourselves.
   int fd[2] = {0, 0};  // parent's, child's
   pid_t childpid = 0;
@@ -130,8 +107,35 @@ int main(int argc, const char **argv, const char *envp[]) {
     if (restart_log)
       g_ceph_context->_log->start();
 
+    int r;
+    Messenger *messenger;
+    Client *client;
+
     cout << "ceph-fuse[" << getpid() << "]: starting ceph client" << std::endl;
-    int r = messenger->start();
+
+    // get monmap
+    MonClient mc(g_ceph_context);
+    r = mc.build_initial_monmap();
+    if (r == -EINVAL)
+      usage();
+    if (r < 0)
+      goto out_mc_start_failed;
+
+    // start up network
+    messenger = Messenger::create(g_ceph_context,
+				  entity_name_t::CLIENT(), "client",
+				  getpid());
+    client = new Client(messenger, &mc);
+
+    messenger->set_default_policy(Messenger::Policy::lossy_client(0, 0));
+    messenger->set_policy(entity_name_t::TYPE_MDS,
+			  Messenger::Policy::lossless_client(0, 0));
+
+    if (filer_flags) {
+      client->set_filer_flags(filer_flags);
+    }
+
+    r = messenger->start();
     if (r < 0) {
       cerr << "ceph-fuse[" << getpid() << "]: ceph mount failed with " << cpp_strerror(-r) << std::endl;
       goto out_messenger_start_failed;
@@ -167,6 +171,7 @@ int main(int argc, const char **argv, const char *envp[]) {
     messenger->wait();
   out_messenger_start_failed:
     delete client;
+  out_mc_start_failed:
 
     if (g_conf->daemonize) {
       //cout << "child signalling parent with " << r << std::endl;