eventfd_synchronization: Fix support for directory change notification objects.

I had misread the code at first and was under the impression these were also
pseudo-fds, but they are not, they are true fds and asyncs just manually
tinker with their signaled status.

patches/eventfd_synchronization/0084-server-Use-default_fd_get_esync_fd-for-directory-cha.patch

@@ -1,12 +1,13 @@
-From 9743c07fc7a759f1e7c893414be8bd95a095921f Mon Sep 17 00:00:00 2001
+From 770e803adbc13c78ee52c7e8435d651da854fcf1 Mon Sep 17 00:00:00 2001
 From: Zebediah Figura <z.figura12@gmail.com>
 Date: Wed, 24 Apr 2019 23:21:25 -0500
-Subject: [PATCH] server: Use default_fd_get_esync_fd() for directory change
- notification objects.
+Subject: [PATCH] server: Create esync file descriptors for true file objects
+ and use them for directory change notifications.
 
 ---
  server/change.c | 2 +-
- 1 file changed, 1 insertion(+), 1 deletion(-)
+ server/fd.c     | 3 +++
+ 2 files changed, 4 insertions(+), 1 deletion(-)
 
 diff --git a/server/change.c b/server/change.c
 index 2be6a8360..9f07be705 100644
@@ -21,6 +22,20 @@ index 2be6a8360..9f07be705 100644
      no_satisfied,             /* satisfied */
      no_signal,                /* signal */
      dir_get_fd,               /* get_fd */
+diff --git a/server/fd.c b/server/fd.c
+index 95f289718..9f51d065e 100644
+--- a/server/fd.c
++++ b/server/fd.c
+@@ -1626,6 +1626,9 @@ static struct fd *alloc_fd_object(void)
+     list_init( &fd->inode_entry );
+     list_init( &fd->locks );
+ 
++    if (do_esync())
++        fd->esync_fd = esync_create_fd( 1, 0 );
++
+     if ((fd->poll_index = add_poll_user( fd )) == -1)
+     {
+         release_object( fd );
 -- 
 2.21.0