build, glusterd: Add liburcu to build system

This patch adds liburcu related checks to the build system and updates
the spec file to require 'userspace-rcu'.

liburcu >= 0.7 is required to build GlusterFS, but 0.8 and above is
preferred. For cases when liburcu 0.7.x is the available version, some
function definitions (currently just one) from liburcu-0.8.6 have been
made available in /contrib/userspace-rcu/.

This change was developed on the git branch at [1]. This commit is a
combination of the following commits on the development branch.
  a5cd6bd Add userspace-rcu checks to configure.ac
  fe5ced3 Add URCU libs to glusterd libtool flags
  1e43302 Add local definition of cds_list_add_tail_rcu for
          liburcu-0.7
  98da755 Move local definition of cds_list_add_tail_rcu into contrib
  8c44dfd Update spec file to include userspace-rcu0466e33 Rename
  rculist-additional.h to rculist-extra.h
  947c7b3 Add rculist-extra.h to dist
  19f32ad Address review comments 9605/1

[1]: https://github.com/kshlm/glusterfs/tree/urcu

Change-Id: Ifbb617d0dacce8fa01214f894badb9d8cdcaf56f
BUG: 1191030
Signed-off-by: Kaushal M <kaushal@redhat.com>
Reviewed-on: http://review.gluster.org/9605
Tested-by: Gluster Build System <jenkins@build.gluster.com>
Reviewed-by: Atin Mukherjee <amukherj@redhat.com>
Reviewed-by: Niels de Vos <ndevos@redhat.com>
Reviewed-by: Krishnan Parthasarathi <kparthas@redhat.com>
Tested-by: Krishnan Parthasarathi <kparthas@redhat.com>

configure.ac

@@ -1098,6 +1098,13 @@ if test "x$BUILD_GLUPY" = "xyes"; then
 fi
 # end glupy section
 
+dnl Check for userspace-rcu
+PKG_CHECK_MODULES([URCU], [liburcu-bp])
+PKG_CHECK_MODULES([URCU_CDS], [liburcu-cds >= 0.8], [],
+  [PKG_CHECK_MODULES([URCU_CDS], [liburcu-cds >= 0.7],
+    [AC_DEFINE(URCU_0_7, 1, [Define if liburcu 0.7 is found])],
+    [AC_MSG_ERROR([liburcu >= 0.7 required])])])
+
 AC_SUBST(CFLAGS)
 # end enable debug section
 

contrib/userspace-rcu/rculist-extra.h

@@ -0,0 +1,42 @@
+/*
+ * Copyright (C) 2002 Free Software Foundation, Inc.
+ * (originally part of the GNU C Library)
+ * Contributed by Ulrich Drepper <drepper@redhat.com>, 2002.
+ *
+ * Copyright (C) 2009 Pierre-Marc Fournier
+ * Conversion to RCU list.
+ * Copyright (C) 2010 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#ifndef URCU_RCULIST_EXTRA_H
+#define URCU_RCULIST_EXTRA_H
+/* Copying this definition from liburcu-0.8 as liburcu-0.7 does not have this
+ * particular list api
+ */
+/* Add new element at the tail of the list. */
+
+static inline
+void cds_list_add_tail_rcu(struct cds_list_head *newp,
+                struct cds_list_head *head)
+{
+        newp->next = head;
+        newp->prev = head->prev;
+        rcu_assign_pointer(head->prev->next, newp);
+        head->prev = newp;
+}
+
+#endif

glusterfs.spec.in

@@ -197,6 +197,7 @@ BuildRequires:    libaio-devel
 BuildRequires:    python-devel
 BuildRequires:    python-ctypes
 BuildRequires:    cmockery2-devel
+BuildRequires:    userspace-rcu-devel >= 0.7
 %if ( 0%{!?_without_systemtap:1} )
 BuildRequires:    systemtap-sdt-devel
 %endif
@@ -1038,6 +1039,9 @@ fi
 %ghost      %attr(0600,-,-) %{_sharedstatedir}/glusterd/nfs/run/nfs.pid
 
 %changelog
+* Wed Feb 18 2015 Kaushal M <kaushal@redhat.com>
+- add userspace-rcu as a requirement
+
 * Fri Feb 13 2015 Gaurav Kumar Garg <ggarg@redhat.com>
 - .cmd_log_history file should be renamed to cmd_history.log post
   upgrade (#1165996)

xlators/mgmt/glusterd/src/Makefile.am

@@ -20,7 +20,7 @@ glusterd_la_SOURCES = glusterd.c glusterd-handler.c glusterd-sm.c \
 glusterd_la_LIBADD = $(top_builddir)/libglusterfs/src/libglusterfs.la \
 		     $(top_builddir)/rpc/xdr/src/libgfxdr.la \
 		     $(top_builddir)/rpc/rpc-lib/src/libgfrpc.la \
-		     $(XML_LIBS) -lcrypto
+		     $(XML_LIBS) -lcrypto $(URCU_LIBS) $(URCU_CDS_LIBS)
 if ENABLE_BD_XLATOR
 glusterd_la_LIBADD += -llvm2app
 endif
@@ -34,19 +34,21 @@ noinst_HEADERS = glusterd.h glusterd-utils.h glusterd-op-sm.h \
 	glusterd-conn-mgmt.h glusterd-conn-helper.h glusterd-proc-mgmt.h \
 	glusterd-svc-mgmt.h glusterd-shd-svc.h glusterd-nfs-svc.h \
 	glusterd-quotad-svc.h glusterd-svc-helper.h glusterd-snapd-svc.h \
-	glusterd-snapd-svc-helper.h
+	glusterd-snapd-svc-helper.h \
+	$(CONTRIBDIR)/userspace-rcu/rculist-extra.h
 
 AM_CPPFLAGS = $(GF_CPPFLAGS) -I$(top_srcdir)/libglusterfs/src \
 	-I$(rpclibdir) -I$(CONTRIBDIR)/rbtree \
 	-I$(top_srcdir)/rpc/xdr/src -I$(top_srcdir)/rpc/rpc-lib/src \
 	-I$(CONTRIBDIR)/uuid -I$(CONTRIBDIR)/mount \
+	-I$(CONTRIBDIR)/userspace-rcu \
 	-DSBIN_DIR=\"$(sbindir)\" -DDATADIR=\"$(localstatedir)\" \
-	-DGSYNCD_PREFIX=\"$(libexecdir)/glusterfs\"\
+	-DGSYNCD_PREFIX=\"$(libexecdir)/glusterfs\" \
-        -DSYNCDAEMON_COMPILE=$(SYNCDAEMON_COMPILE) $(XML_CPPFLAGS)
+	-DSYNCDAEMON_COMPILE=$(SYNCDAEMON_COMPILE) $(XML_CPPFLAGS)
 
-AM_CFLAGS = -Wall $(GF_CFLAGS)
+AM_CFLAGS = -Wall $(GF_CFLAGS) $(URCU_CFLAGS) $(URCU_CDS_CFLAGS)
 
-AM_LDFLAGS = -L$(xlatordir)
+AM_LDFLAGS = -L$(xlatordir) $(URCU_LIBS) $(URCU_CDS_LIBS)
 
 CLEANFILES =
 

xlators/mgmt/glusterd/src/glusterd.h

@@ -20,6 +20,12 @@
 #include <pthread.h>
 #include <libgen.h>
 
+#include <urcu-bp.h>
+#include <urcu/rculist.h>
+#ifdef URCU_0_7
+#include "rculist-extra.h"
+#endif
+
 #include "uuid.h"
 
 #include "rpc-clnt.h"
@@ -1057,4 +1063,5 @@ glusterd_add_brick_status_to_dict (dict_t *dict, glusterd_volinfo_t *volinfo,
 
 int32_t
 glusterd_handle_snap_limit (dict_t *dict, dict_t *rsp_dict);
+
 #endif