libglusterfs : packing functions for compound fops

Any xlator that wants to compound fops together can
use these apis to get the job done.

Change-Id: Ic40fceafecafe70173fd469060e834314826a92c
BUG: 1303829
Signed-off-by: Anuradha Talur <atalur@redhat.com>
Reviewed-on: http://review.gluster.org/13694
Reviewed-by: Pranith Kumar Karampuri <pkarampu@redhat.com>
NetBSD-regression: NetBSD Build System <jenkins@build.gluster.org>
Smoke: Gluster Build System <jenkins@build.gluster.com>
CentOS-regression: Gluster Build System <jenkins@build.gluster.com>

2 files changed, 74 insertions, 1 deletions

diff --git a/libglusterfs/src/Makefile.am b/libglusterfs/src/Makefile.am
index fbe30da76f0..63feb380e66 100644
--- a/libglusterfs/src/Makefile.am
+++ b/libglusterfs/src/Makefile.am
@@ -31,7 +31,8 @@ libglusterfs_la_SOURCES = dict.c xlator.c logging.c \
 	strfd.c parse-utils.c $(CONTRIBDIR)/mount/mntent.c \
 	$(CONTRIBDIR)/libexecinfo/execinfo.c quota-common-utils.c rot-buffs.c \
 	$(CONTRIBDIR)/timer-wheel/timer-wheel.c \
-	$(CONTRIBDIR)/timer-wheel/find_last_bit.c tw.c default-args.c locking.c
+	$(CONTRIBDIR)/timer-wheel/find_last_bit.c tw.c default-args.c locking.c \
+	compound-fop-utils.c
 
 nodist_libglusterfs_la_SOURCES = y.tab.c graph.lex.c defaults.c
 nodist_libglusterfs_la_HEADERS = y.tab.h glusterfs-fops.h
diff --git a/libglusterfs/src/compound-fop-utils.c b/libglusterfs/src/compound-fop-utils.c
new file mode 100644
index 00000000000..16cd5c690e5
--- /dev/null
+++ b/libglusterfs/src/compound-fop-utils.c
@@ -0,0 +1,72 @@
+/*
+  Copyright (c) 2016 Red Hat, Inc. <http://www.redhat.com>
+  This file is part of GlusterFS.
+
+  This file is licensed to you under your choice of the GNU Lesser
+  General Public License, version 3 or any later version (LGPLv3 or
+  later), or the GNU General Public License, version 2 (GPLv2), in all
+  cases as published by the Free Software Foundation.
+*/
+
+#include "defaults.h"
+#include "default-args.h"
+#include "mem-types.h"
+#include "dict.h"
+
+compound_args_t*
+compound_fop_alloc (int length, glusterfs_compound_fop_t fop, dict_t *xdata)
+{
+        compound_args_t *args     = NULL;
+
+        args = GF_CALLOC (1, sizeof (args), gf_mt_compound_req_t);
+
+        if (!args)
+                return NULL;
+
+        /* fop_enum can be used by xlators to see which fops are
+         * included as part of compound fop. This will help in checking
+         * for compatibility or support without going through the entire
+         * fop list packed.
+         */
+        args->fop_enum = fop;
+        args->fop_length   = length;
+
+        args->enum_list = GF_CALLOC (length, sizeof (*args->enum_list),
+                                     gf_common_mt_int);
+
+        if (!args->enum_list)
+                goto out;
+
+        args->req_list = GF_CALLOC (length, sizeof (*args->req_list),
+                                     gf_mt_default_args_t);
+
+        if (!args->req_list)
+                goto out;
+
+        if (xdata) {
+                args->xdata = dict_copy_with_ref (xdata, args->xdata);
+                if (!args->xdata)
+                        goto out;
+        }
+
+        return args;
+out:
+        if (args->xdata)
+                dict_unref (args->xdata);
+
+        if (args->req_list)
+                GF_FREE (args->req_list);
+
+        if (args->enum_list)
+                GF_FREE (args->enum_list);
+
+        if (args)
+                GF_FREE (args);
+
+        return NULL;
+}
+
+#define COMPOUND_PACK_ARGS(fop, fop_enum, args, counter, params ...) do {    \
+        args->enum_list[counter] = fop_enum;                                 \
+        args_##fop##_store (&args->req_list[counter], params);               \
+} while (0)