performance/decompounder: Introducing decompounder xlator

This xlator decompounds the compound fops received,
and executes them serially.

Change-Id: Ieddcec3c2983dd9ca7919ba9d7ecaa5192a5f489
BUG: 1303829
Signed-off-by: Anuradha Talur <atalur@redhat.com>
Reviewed-on: http://review.gluster.org/13577
Smoke: Gluster Build System <jenkins@build.gluster.com>
NetBSD-regression: NetBSD Build System <jenkins@build.gluster.org>
CentOS-regression: Gluster Build System <jenkins@build.gluster.com>
Reviewed-by: Pranith Kumar Karampuri <pkarampu@redhat.com>

20 files changed, 1168 insertions, 27 deletions

diff --git a/configure.ac b/configure.ac
index f479dd71138..56f13d5be97 100644
--- a/configure.ac
+++ b/configure.ac
@@ -97,6 +97,8 @@ AC_CONFIG_FILES([Makefile
                 xlators/performance/open-behind/src/Makefile
                 xlators/performance/md-cache/Makefile
                 xlators/performance/md-cache/src/Makefile
+                xlators/performance/decompounder/Makefile
+                xlators/performance/decompounder/src/Makefile
                 xlators/debug/Makefile
                 xlators/debug/trace/Makefile
                 xlators/debug/trace/src/Makefile
diff --git a/glusterfs.spec.in b/glusterfs.spec.in
index f91b19879a2..fc3e72edb51 100644
--- a/glusterfs.spec.in
+++ b/glusterfs.spec.in
@@ -1114,6 +1114,7 @@ exit 0
 %{_libdir}/glusterfs/%{version}%{?prereltag}/xlator/nfs*
 %{_libdir}/glusterfs/%{version}%{?prereltag}/xlator/protocol/server*
 %{_libdir}/glusterfs/%{version}%{?prereltag}/xlator/storage*
+%{_libdir}/glusterfs/%{version}%{?prereltag}/xlator/performance/decompounder.so
 %if ( 0%{!?_without_tiering:1} )
 %{_libdir}/libgfdb.so.*
 %endif
diff --git a/libglusterfs/src/call-stub.c b/libglusterfs/src/call-stub.c
index 42ebca6b3cc..99371ce8ff8 100644
--- a/libglusterfs/src/call-stub.c
+++ b/libglusterfs/src/call-stub.c
@@ -2360,32 +2360,9 @@ out:
 static void
 call_stub_wipe_args (call_stub_t *stub)
 {
-	loc_wipe (&stub->args.loc);
-
-	loc_wipe (&stub->args.loc2);
-
-	if (stub->args.fd)
-		fd_unref (stub->args.fd);
-
-	GF_FREE ((char *)stub->args.linkname);
-
-	GF_FREE (stub->args.vector);
-
-	if (stub->args.iobref)
-		iobref_unref (stub->args.iobref);
-
-	if (stub->args.xattr)
-		dict_unref (stub->args.xattr);
-
-	GF_FREE ((char *)stub->args.name);
-
-	GF_FREE ((char *)stub->args.volume);
-
-	if (stub->args.xdata)
-		dict_unref (stub->args.xdata);
+        args_wipe (&stub->args);
 }
 
-
 static void
 call_stub_wipe_args_cbk (call_stub_t *stub)
 {
diff --git a/libglusterfs/src/common-utils.c b/libglusterfs/src/common-utils.c
index 21fe3841be9..bfddfc3124c 100644
--- a/libglusterfs/src/common-utils.c
+++ b/libglusterfs/src/common-utils.c
@@ -4327,8 +4327,9 @@ fop_enum_to_pri_string (glusterfs_fop_t fop)
         case GF_FOP_MAXVALUE:
         case GF_FOP_DISCARD:
                 return "LEAST";
+        default:
+                return "UNKNOWN";
         }
-        return "UNKNOWN";
 }
 
 const char *
@@ -4385,6 +4386,8 @@ fop_enum_to_string (glusterfs_fop_t fop)
                 "DISCARD",
                 "ZEROFILL",
                 "IPC",
+                "SEEK",
+                "COMPOUND",
                 "MAXVALUE"};
         if (fop <= GF_FOP_MAXVALUE)
                 return str_map[fop];
diff --git a/libglusterfs/src/default-args.c b/libglusterfs/src/default-args.c
index 29c8aeae9fd..1ce907f6221 100644
--- a/libglusterfs/src/default-args.c
+++ b/libglusterfs/src/default-args.c
@@ -1486,3 +1486,37 @@ args_cbk_wipe (default_args_cbk_t *args_cbk)
         if (!list_empty (&args_cbk->entries.list))
                 gf_dirent_free (&args_cbk->entries);
 }
+
+void
+args_wipe (default_args_t *args)
+{
+        if (!args)
+                return;
+
+        if (&args->loc)
+                loc_wipe (&args->loc);
+
+        if (&args->loc2)
+                loc_wipe (&args->loc2);
+
+        if (args->fd)
+                fd_unref (args->fd);
+
+        GF_FREE ((char *)args->linkname);
+
+	GF_FREE (args->vector);
+
+        if (args->iobref)
+                iobref_unref (args->iobref);
+
+        if (args->xattr)
+                dict_unref (args->xattr);
+
+        if (args->xdata)
+                dict_unref (args->xdata);
+
+	GF_FREE ((char *)args->name);
+
+	GF_FREE ((char *)args->volume);
+
+}
diff --git a/libglusterfs/src/default-args.h b/libglusterfs/src/default-args.h
index a6ed0e484da..86dafe63e83 100644
--- a/libglusterfs/src/default-args.h
+++ b/libglusterfs/src/default-args.h
@@ -276,6 +276,9 @@ args_lease_cbk_store (default_args_cbk_t *args,
 void
 args_cbk_wipe (default_args_cbk_t *args_cbk);
 
+void
+args_wipe (default_args_t *args);
+
 int
 args_lookup_store (default_args_t *args, loc_t *loc,
                    dict_t *xdata);
diff --git a/libglusterfs/src/defaults.h b/libglusterfs/src/defaults.h
index 148dc84b1c5..cae69a536a3 100644
--- a/libglusterfs/src/defaults.h
+++ b/libglusterfs/src/defaults.h
@@ -78,6 +78,22 @@ typedef struct {
         struct gf_lease lease;
 } default_args_t;
 
+typedef struct {
+        int             fop_enum;
+        int             fop_length;
+        int             *enum_list;
+        default_args_t  *req_list;
+        dict_t          *xdata;
+} compound_args_t;
+
+typedef struct {
+        int                fop_enum;
+        int                fop_length;
+        int                *enum_list;
+        default_args_cbk_t *rsp_list;
+        dict_t             *xdata;
+} compound_args_cbk_t;
+
 int32_t default_notify (xlator_t *this,
                         int32_t event,
                         void *data,
diff --git a/libglusterfs/src/glfs-message-id.h b/libglusterfs/src/glfs-message-id.h
index 18104dab90f..d772dd37983 100644
--- a/libglusterfs/src/glfs-message-id.h
+++ b/libglusterfs/src/glfs-message-id.h
@@ -170,6 +170,10 @@ GLFS_MSGID_COMP_SYMLINK_CACHE_END
 #define GLFS_MSGID_COMP_PL               GLFS_MSGID_COMP_JBR_END
 #define GLFS_MSGID_COMP_PL_END           (GLFS_MSGID_COMP_PL +\
                                          GLFS_MSGID_SEGMENT)
+
+#define GLFS_MSGID_COMP_DC                     GLFS_MSGID_COMP_PL_END
+#define GLFS_MSGID_COMP_DC_END                 (GLFS_MSGID_COMP_PL_END+\
+                                                 GLFS_MSGID_SEGMENT)
 /* --- new segments for messages goes above this line --- */
 
 #endif /* !_GLFS_MESSAGE_ID_H_ */
diff --git a/libglusterfs/src/globals.c b/libglusterfs/src/globals.c
index 0645ffadb10..997994f049e 100644
--- a/libglusterfs/src/globals.c
+++ b/libglusterfs/src/globals.c
@@ -70,6 +70,7 @@ const char *gf_fop_list[GF_FOP_MAXVALUE] = {
         [GF_FOP_IPC]         = "IPC",
         [GF_FOP_SEEK]        = "SEEK",
         [GF_FOP_LEASE]       = "LEASE",
+        [GF_FOP_COMPOUND]    = "COMPOUND",
 };
 /* THIS */
 
diff --git a/libglusterfs/src/glusterfs.h b/libglusterfs/src/glusterfs.h
index 9d077e5ad61..d3be103d074 100644
--- a/libglusterfs/src/glusterfs.h
+++ b/libglusterfs/src/glusterfs.h
@@ -269,7 +269,8 @@
 
 /* NOTE: add members ONLY at the end (just before _MAXVALUE) */
 /*
- * OTHER NOTE: fop_enum_to_str and fop_enum_to_pri_str (in common-utils.h) also
+ * OTHER NOTE: fop_enum_to_str and fop_enum_to_pri_str (in common-utils.h)
+ * and gf_fop_list in globals.c also
  * contain lists of fops, so if you update this list UPDATE THOSE TOO.
  */
 typedef enum {
@@ -325,6 +326,7 @@ typedef enum {
         GF_FOP_IPC,
         GF_FOP_SEEK,
         GF_FOP_LEASE,
+        GF_FOP_COMPOUND,
         GF_FOP_MAXVALUE,
 } glusterfs_fop_t;
 
diff --git a/libglusterfs/src/mem-types.h b/libglusterfs/src/mem-types.h
index 639ba3721f1..e185a49ec21 100644
--- a/libglusterfs/src/mem-types.h
+++ b/libglusterfs/src/mem-types.h
@@ -159,6 +159,11 @@ enum gf_common_mem_types_ {
         gf_common_mt_syncenv,
         gf_common_mt_scan_data,
         gf_common_list_node,
+        gf_mt_default_args_t,
+        gf_mt_default_args_cbk_t,
+        /*used for compound fops*/
+        gf_mt_compound_req_t,
+        gf_mt_compound_rsp_t,
         gf_common_mt_end
 };
 #endif
diff --git a/libglusterfs/src/xlator.h b/libglusterfs/src/xlator.h
index 84f48edba2c..052dd978a63 100644
--- a/libglusterfs/src/xlator.h
+++ b/libglusterfs/src/xlator.h
@@ -452,6 +452,10 @@ typedef int32_t (*fop_lease_cbk_t) (call_frame_t *frame, void *cookie,
                                     xlator_t *this, int32_t op_ret,
                                     int32_t op_errno, struct gf_lease *lease,
                                     dict_t *xdata);
+typedef int32_t (*fop_compound_cbk_t) (call_frame_t *frame,
+                                       void *cookie, xlator_t *this,
+                                       int32_t op_ret, int32_t op_errno,
+                                       void *data, dict_t *xdata);
 
 typedef int32_t (*fop_lookup_t) (call_frame_t *frame,
                                  xlator_t *this,
@@ -702,6 +706,8 @@ typedef int32_t (*fop_seek_t) (call_frame_t *frame, xlator_t *this, fd_t *fd,
 typedef int32_t (*fop_lease_t) (call_frame_t *frame, xlator_t *this, loc_t *loc,
                                 struct gf_lease *lease, dict_t *xdata);
 
+typedef int32_t (*fop_compound_t) (call_frame_t *frame, xlator_t *this,
+                                   void *args, dict_t *xdata);
 struct xlator_fops {
         fop_lookup_t         lookup;
         fop_stat_t           stat;
@@ -751,6 +757,7 @@ struct xlator_fops {
         fop_ipc_t            ipc;
         fop_seek_t           seek;
         fop_lease_t          lease;
+        fop_compound_t       compound;
 
         /* these entries are used for a typechecking hack in STACK_WIND _only_ */
         fop_lookup_cbk_t         lookup_cbk;
@@ -801,6 +808,7 @@ struct xlator_fops {
         fop_ipc_cbk_t            ipc_cbk;
         fop_seek_cbk_t           seek_cbk;
         fop_lease_cbk_t          lease_cbk;
+        fop_compound_cbk_t       compound_cbk;
 };
 
 typedef int32_t (*cbk_forget_t) (xlator_t *this,
diff --git a/rpc/rpc-lib/src/protocol-common.h b/rpc/rpc-lib/src/protocol-common.h
index 2da9e57bf8b..e5722731d51 100644
--- a/rpc/rpc-lib/src/protocol-common.h
+++ b/rpc/rpc-lib/src/protocol-common.h
@@ -61,6 +61,7 @@ enum gf_fop_procnum {
         GFS3_OP_ZEROFILL,
         GFS3_OP_IPC,
         GFS3_OP_SEEK,
+        GFS3_OP_COMPOUND,
         GFS3_OP_MAXVALUE,
 } ;
 
diff --git a/xlators/performance/Makefile.am b/xlators/performance/Makefile.am
index a494190baac..eb4e32cbb14 100644
--- a/xlators/performance/Makefile.am
+++ b/xlators/performance/Makefile.am
@@ -1,3 +1,3 @@
-SUBDIRS = write-behind read-ahead readdir-ahead io-threads io-cache symlink-cache quick-read md-cache open-behind
+SUBDIRS = write-behind read-ahead readdir-ahead io-threads io-cache symlink-cache quick-read md-cache open-behind decompounder
 
 CLEANFILES = 
diff --git a/xlators/performance/decompounder/Makefile.am b/xlators/performance/decompounder/Makefile.am
new file mode 100644
index 00000000000..af437a64d6d
--- /dev/null
+++ b/xlators/performance/decompounder/Makefile.am
@@ -0,0 +1 @@
+SUBDIRS = src
diff --git a/xlators/performance/decompounder/src/Makefile.am b/xlators/performance/decompounder/src/Makefile.am
new file mode 100644
index 00000000000..693fe0aa5c2
--- /dev/null
+++ b/xlators/performance/decompounder/src/Makefile.am
@@ -0,0 +1,16 @@
+xlator_LTLIBRARIES = decompounder.la
+xlatordir = $(libdir)/glusterfs/$(PACKAGE_VERSION)/xlator/performance
+
+decompounder_la_LDFLAGS = -module $(GF_XLATOR_DEFAULT_LDFLAGS)
+
+decompounder_la_SOURCES = decompounder.c
+decompounder_la_LIBADD = $(top_builddir)/libglusterfs/src/libglusterfs.la
+
+noinst_HEADERS = decompounder-mem-types.h decompounder-messages.h \
+		 decompounder.h
+
+AM_CPPFLAGS = $(GF_CPPFLAGS) -I$(top_srcdir)/libglusterfs/src
+
+AM_CFLAGS = -Wall $(GF_CFLAGS)
+
+CLEANFILES =
diff --git a/xlators/performance/decompounder/src/decompounder-mem-types.h b/xlators/performance/decompounder/src/decompounder-mem-types.h
new file mode 100644
index 00000000000..5c211c1a907
--- /dev/null
+++ b/xlators/performance/decompounder/src/decompounder-mem-types.h
@@ -0,0 +1,20 @@
+/*
+  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.
+*/
+
+#ifndef __DC_MEM_TYPES_H__
+#define __DC_MEM_TYPES_H__
+
+#include "mem-types.h"
+
+enum gf_dc_mem_types_ {
+        gf_dc_mt_rsp_t              = gf_common_mt_end + 1,
+        gf_dc_mt_end
+};
+#endif
diff --git a/xlators/performance/decompounder/src/decompounder-messages.h b/xlators/performance/decompounder/src/decompounder-messages.h
new file mode 100644
index 00000000000..825599e9479
--- /dev/null
+++ b/xlators/performance/decompounder/src/decompounder-messages.h
@@ -0,0 +1,27 @@
+/*
+  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.
+*/
+
+#ifndef _DC_MESSAGES_H_
+#define _DC_MESSAGES_H_
+
+#include "glfs-message-id.h"
+
+#define GLFS_COMP_BASE_DC      GLFS_MSGID_COMP_DC
+#define GLFS_NUM_MESSAGES           2
+#define GLFS_MSGID_END         (GLFS_COMP_BASE_DC + GLFS_NUM_MESSAGES + 1)
+
+#define glfs_msg_start_x GLFS_COMP_BASE_DC, "Invalid: Start of messages"
+
+#define DC_MSG_VOL_MISCONFIGURED               (GLFS_COMP_BASE_DC + 1)
+
+#define DC_MSG_ERROR_RECEIVED                  (GLFS_COMP_BASE_DC + 2)
+
+#define glfs_msg_end_x GLFS_MSGID_END, "Invalid: End of messages"
+#endif /* !_DC_MESSAGES_H_ */
diff --git a/xlators/performance/decompounder/src/decompounder.c b/xlators/performance/decompounder/src/decompounder.c
new file mode 100644
index 00000000000..830876ec0bf
--- /dev/null
+++ b/xlators/performance/decompounder/src/decompounder.c
@@ -0,0 +1,946 @@
+/*
+  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 "decompounder.h"
+#include "mem-types.h"
+
+void
+dc_local_cleanup (dc_local_t *local)
+{
+        int i = 0;
+
+        for (i = 0; i < local->length; i++)
+                args_cbk_wipe (&local->compound_rsp->rsp_list[i]);
+
+        GF_FREE (local->compound_rsp->rsp_list);
+        GF_FREE (local->compound_rsp);
+        return;
+}
+
+int32_t
+dc_stat_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
+             int32_t op_ret, int32_t op_errno, struct iatt *buf,
+             dict_t *xdata)
+{
+
+        DC_FOP_RESPONSE_STORE_AND_WIND_NEXT (stat, frame, op_ret,
+                                             op_errno, buf, xdata);
+        return 0;
+}
+
+int32_t
+dc_readlink_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
+                 int32_t op_ret, int32_t op_errno, const char *path,
+                 struct iatt *buf, dict_t *xdata)
+{
+        DC_FOP_RESPONSE_STORE_AND_WIND_NEXT (readlink, frame, op_ret, op_errno,
+                                             path, buf, xdata);
+        return 0;
+}
+
+
+int32_t
+dc_mknod_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
+              int32_t op_ret, int32_t op_errno, inode_t *inode,
+              struct iatt *buf, struct iatt *preparent,
+              struct iatt *postparent, dict_t *xdata)
+{
+        DC_FOP_RESPONSE_STORE_AND_WIND_NEXT (mknod, frame, op_ret, op_errno,
+                                             inode, buf, preparent,
+                                             postparent, xdata);
+        return 0;
+}
+
+
+int32_t
+dc_mkdir_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
+              int32_t op_ret, int32_t op_errno, inode_t *inode,
+              struct iatt *buf, struct iatt *preparent,
+              struct iatt *postparent, dict_t *xdata)
+{
+        DC_FOP_RESPONSE_STORE_AND_WIND_NEXT (mkdir, frame, op_ret, op_errno,
+                                             inode, buf, preparent, postparent,
+                                             xdata);
+        return 0;
+}
+
+
+int32_t
+dc_unlink_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
+               int32_t op_ret, int32_t op_errno, struct iatt *preparent,
+               struct iatt *postparent,
+               dict_t *xdata)
+{
+        DC_FOP_RESPONSE_STORE_AND_WIND_NEXT (unlink, frame, op_ret, op_errno,
+                                             preparent, postparent, xdata);
+        return 0;
+}
+
+
+int32_t
+dc_rmdir_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
+              int32_t op_ret, int32_t op_errno, struct iatt *preparent,
+              struct iatt *postparent,
+              dict_t *xdata)
+{
+        DC_FOP_RESPONSE_STORE_AND_WIND_NEXT (rmdir, frame, op_ret, op_errno,
+                                             preparent, postparent, xdata);
+        return 0;
+}
+
+
+int32_t
+dc_symlink_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
+                int32_t op_ret, int32_t op_errno, inode_t *inode,
+                struct iatt *buf, struct iatt *preparent,
+                struct iatt *postparent, dict_t *xdata)
+{
+        DC_FOP_RESPONSE_STORE_AND_WIND_NEXT (symlink, frame, op_ret, op_errno,
+                                             inode, buf, preparent, postparent,
+                                             xdata);
+        return 0;
+}
+
+
+int32_t
+dc_rename_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
+              int32_t op_ret, int32_t op_errno, struct iatt *buf,
+              struct iatt *preoldparent,
+              struct iatt *postoldparent,
+              struct iatt *prenewparent,
+              struct iatt *postnewparent,
+              dict_t *xdata)
+{
+        DC_FOP_RESPONSE_STORE_AND_WIND_NEXT (rename, frame, op_ret, op_errno,
+                                             buf, preoldparent, postoldparent,
+                                             prenewparent, postnewparent,
+                                             xdata);
+        return 0;
+}
+
+
+int32_t
+dc_link_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
+             int32_t op_ret, int32_t op_errno, inode_t *inode,
+             struct iatt *buf,
+             struct iatt *preparent,
+             struct iatt *postparent,
+             dict_t *xdata)
+{
+        DC_FOP_RESPONSE_STORE_AND_WIND_NEXT (link, frame, op_ret, op_errno,
+                                             inode, buf, preparent, postparent,
+                                             xdata);
+        return 0;
+}
+
+
+int32_t
+dc_truncate_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
+                 int32_t op_ret, int32_t op_errno, struct iatt *prebuf,
+                 struct iatt *postbuf, dict_t *xdata)
+{
+        DC_FOP_RESPONSE_STORE_AND_WIND_NEXT (truncate, frame, op_ret, op_errno,
+                                             prebuf, postbuf, xdata);
+        return 0;
+}
+
+
+int32_t
+dc_open_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
+             int32_t op_ret, int32_t op_errno, fd_t *fd, dict_t *xdata)
+{
+        DC_FOP_RESPONSE_STORE_AND_WIND_NEXT (open, frame, op_ret, op_errno,
+                                             fd, xdata);
+        return 0;
+}
+
+
+int32_t
+dc_readv_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
+              int32_t op_ret, int32_t op_errno, struct iovec *vector,
+              int32_t count,
+              struct iatt *stbuf,
+              struct iobref *iobref,
+              dict_t *xdata)
+{
+        DC_FOP_RESPONSE_STORE_AND_WIND_NEXT (readv, frame, op_ret, op_errno,
+                                             vector, count, stbuf, iobref, xdata);
+        return 0;
+}
+
+
+int32_t
+dc_writev_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
+              int32_t op_ret, int32_t op_errno, struct iatt *prebuf,
+              struct iatt *postbuf,
+              dict_t *xdata)
+{
+        DC_FOP_RESPONSE_STORE_AND_WIND_NEXT (writev, frame, op_ret, op_errno,
+                                             prebuf, postbuf, xdata);
+        return 0;
+}
+
+
+int32_t
+dc_statfs_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
+               int32_t op_ret, int32_t op_errno, struct statvfs *buf,
+               dict_t *xdata)
+{
+        DC_FOP_RESPONSE_STORE_AND_WIND_NEXT (statfs, frame, op_ret, op_errno,
+                                             buf, xdata);
+        return 0;
+}
+
+
+int32_t
+dc_flush_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
+                    int32_t op_ret, int32_t op_errno, dict_t *xdata)
+{
+        DC_FOP_RESPONSE_STORE_AND_WIND_NEXT (flush, frame, op_ret, op_errno,
+                                             xdata);
+        return 0;
+}
+
+
+int32_t
+dc_fsync_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
+             int32_t op_ret, int32_t op_errno, struct iatt *prebuf,
+             struct iatt *postbuf,
+             dict_t *xdata)
+{
+        DC_FOP_RESPONSE_STORE_AND_WIND_NEXT (fsync, frame, op_ret, op_errno,
+                                             prebuf, postbuf, xdata);
+        return 0;
+}
+
+
+int32_t
+dc_setxattr_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
+                 int32_t op_ret, int32_t op_errno, dict_t *xdata)
+{
+        DC_FOP_RESPONSE_STORE_AND_WIND_NEXT (setxattr, frame, op_ret, op_errno,
+                                             xdata);
+        return 0;
+}
+
+
+int32_t
+dc_getxattr_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
+                 int32_t op_ret, int32_t op_errno, dict_t *dict,
+                 dict_t *xdata)
+{
+        DC_FOP_RESPONSE_STORE_AND_WIND_NEXT (getxattr, frame, op_ret, op_errno,
+                                             dict, xdata);
+        return 0;
+}
+
+
+int32_t
+dc_removexattr_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
+                    int32_t op_ret, int32_t op_errno, dict_t *xdata)
+{
+        DC_FOP_RESPONSE_STORE_AND_WIND_NEXT (removexattr, frame, op_ret, op_errno,
+                                             xdata);
+        return 0;
+}
+
+int32_t
+dc_opendir_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
+                int32_t op_ret, int32_t op_errno, fd_t *fd,
+                dict_t *xdata)
+{
+        DC_FOP_RESPONSE_STORE_AND_WIND_NEXT (opendir, frame, op_ret, op_errno,
+                                             fd, xdata);
+        return 0;
+}
+
+
+int32_t
+dc_fsyncdir_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
+                 int32_t op_ret, int32_t op_errno, dict_t *xdata)
+{
+        DC_FOP_RESPONSE_STORE_AND_WIND_NEXT (fsyncdir, frame, op_ret, op_errno,
+                                             xdata);
+        return 0;
+}
+
+
+int32_t
+dc_access_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
+               int32_t op_ret, int32_t op_errno, dict_t *xdata)
+{
+        DC_FOP_RESPONSE_STORE_AND_WIND_NEXT (access, frame, op_ret, op_errno,
+                                             xdata);
+        return 0;
+}
+
+
+int32_t
+dc_create_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
+               int32_t op_ret, int32_t op_errno, fd_t *fd,
+               inode_t *inode,
+               struct iatt *buf,
+               struct iatt *preparent,
+               struct iatt *postparent,
+               dict_t *xdata)
+{
+        DC_FOP_RESPONSE_STORE_AND_WIND_NEXT (create, frame, op_ret, op_errno,
+                                             fd, inode, buf, preparent,
+                                             postparent, xdata);
+        return 0;
+}
+
+
+int32_t
+dc_ftruncate_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
+                  int32_t op_ret, int32_t op_errno, struct iatt *prebuf,
+                  struct iatt *postbuf, dict_t *xdata)
+{
+        DC_FOP_RESPONSE_STORE_AND_WIND_NEXT (ftruncate, frame, op_ret, op_errno,
+                                             prebuf, postbuf, xdata);
+        return 0;
+}
+
+
+int32_t
+dc_fstat_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
+              int32_t op_ret, int32_t op_errno, struct iatt *buf,
+              dict_t *xdata)
+{
+        DC_FOP_RESPONSE_STORE_AND_WIND_NEXT (fstat, frame, op_ret, op_errno,
+                                             buf, xdata);
+        return 0;
+}
+
+
+int32_t
+dc_lk_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
+           int32_t op_ret, int32_t op_errno, struct gf_flock *lock,
+           dict_t *xdata)
+{
+        DC_FOP_RESPONSE_STORE_AND_WIND_NEXT (lk, frame, op_ret, op_errno,
+                                             lock, xdata);
+        return 0;
+}
+
+
+int32_t
+dc_lookup_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
+               int32_t op_ret, int32_t op_errno, inode_t *inode,
+               struct iatt *buf,
+               dict_t *xdata,
+               struct iatt *postparent)
+{
+        DC_FOP_RESPONSE_STORE_AND_WIND_NEXT (lookup, frame, op_ret, op_errno,
+                                             inode, buf, xdata, postparent);
+        return 0;
+}
+
+
+int32_t
+dc_readdir_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
+                int32_t op_ret, int32_t op_errno, gf_dirent_t *entries,
+                dict_t *xdata)
+{
+        DC_FOP_RESPONSE_STORE_AND_WIND_NEXT (readdir, frame, op_ret, op_errno,
+                                             entries, xdata);
+        return 0;
+}
+
+
+int32_t
+dc_inodelk_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
+                int32_t op_ret, int32_t op_errno, dict_t *xdata)
+{
+        DC_FOP_RESPONSE_STORE_AND_WIND_NEXT (inodelk, frame, op_ret, op_errno,
+                                             xdata);
+        return 0;
+}
+
+
+int32_t
+dc_finodelk_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
+                    int32_t op_ret, int32_t op_errno, dict_t *xdata)
+{
+        DC_FOP_RESPONSE_STORE_AND_WIND_NEXT (finodelk, frame, op_ret, op_errno,
+                                             xdata);
+        return 0;
+}
+
+
+int32_t
+dc_entrylk_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
+                int32_t op_ret, int32_t op_errno, dict_t *xdata)
+{
+        DC_FOP_RESPONSE_STORE_AND_WIND_NEXT (entrylk, frame, op_ret, op_errno,
+                                             xdata);
+        return 0;
+}
+
+
+int32_t
+dc_fentrylk_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
+                    int32_t op_ret, int32_t op_errno, dict_t *xdata)
+{
+        DC_FOP_RESPONSE_STORE_AND_WIND_NEXT (fentrylk, frame, op_ret, op_errno,
+                                             xdata);
+        return 0;
+}
+
+
+int32_t
+dc_xattrop_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
+                int32_t op_ret, int32_t op_errno, dict_t *dict,
+                dict_t *xdata)
+{
+        DC_FOP_RESPONSE_STORE_AND_WIND_NEXT (xattrop, frame, op_ret, op_errno,
+                                             dict, xdata);
+        return 0;
+}
+
+
+int32_t
+dc_fxattrop_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
+                 int32_t op_ret, int32_t op_errno, dict_t *dict,
+                 dict_t *xdata)
+{
+        DC_FOP_RESPONSE_STORE_AND_WIND_NEXT (fxattrop, frame, op_ret, op_errno,
+                                             dict, xdata);
+        return 0;
+}
+
+
+int32_t
+dc_fgetxattr_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
+                  int32_t op_ret, int32_t op_errno, dict_t *dict,
+        dict_t *xdata)
+{
+        DC_FOP_RESPONSE_STORE_AND_WIND_NEXT (fgetxattr, frame, op_ret, op_errno,
+                                             dict, xdata);
+        return 0;
+}
+
+
+int32_t
+dc_fsetxattr_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
+                  int32_t op_ret, int32_t op_errno, dict_t *xdata)
+{
+        DC_FOP_RESPONSE_STORE_AND_WIND_NEXT (fsetxattr, frame, op_ret, op_errno,
+                                             xdata);
+        return 0;
+}
+
+
+int32_t
+dc_rchecksum_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
+                  int32_t op_ret, int32_t op_errno, uint32_t weak_cksum,
+                  uint8_t *strong_cksum, dict_t *xdata)
+{
+        DC_FOP_RESPONSE_STORE_AND_WIND_NEXT (rchecksum, frame, op_ret, op_errno,
+                                             weak_cksum, strong_cksum, xdata);
+        return 0;
+}
+
+
+int32_t
+dc_setattr_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
+                int32_t op_ret, int32_t op_errno, struct iatt *statpre,
+                struct iatt *statpost, dict_t *xdata)
+{
+        DC_FOP_RESPONSE_STORE_AND_WIND_NEXT (setattr, frame, op_ret, op_errno,
+                                             statpre, statpost, xdata);
+        return 0;
+}
+
+
+int32_t
+dc_fsetattr_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
+                 int32_t op_ret, int32_t op_errno, struct iatt *statpre,
+                 struct iatt *statpost, dict_t *xdata)
+{
+        DC_FOP_RESPONSE_STORE_AND_WIND_NEXT (fsetattr, frame, op_ret, op_errno,
+                                             statpre, statpost, xdata);
+        return 0;
+}
+
+
+int32_t
+dc_readdirp_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
+                 int32_t op_ret, int32_t op_errno, gf_dirent_t *entries,
+                 dict_t *xdata)
+{
+        DC_FOP_RESPONSE_STORE_AND_WIND_NEXT (readdirp, frame, op_ret, op_errno,
+                                             entries, xdata);
+        return 0;
+}
+
+
+int32_t
+dc_fremovexattr_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
+                    int32_t op_ret, int32_t op_errno, dict_t *xdata)
+{
+        DC_FOP_RESPONSE_STORE_AND_WIND_NEXT (fremovexattr, frame, op_ret, op_errno,
+                                             xdata);
+        return 0;
+}
+
+
+int32_t
+dc_fallocate_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
+                  int32_t op_ret, int32_t op_errno, struct iatt *pre,
+                  struct iatt *post, dict_t *xdata)
+{
+        DC_FOP_RESPONSE_STORE_AND_WIND_NEXT (fallocate, frame, op_ret, op_errno,
+                                             pre, post, xdata);
+        return 0;
+}
+
+
+int32_t
+dc_discard_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
+                int32_t op_ret, int32_t op_errno, struct iatt *pre,
+                struct iatt *post, dict_t *xdata)
+{
+        DC_FOP_RESPONSE_STORE_AND_WIND_NEXT (discard, frame, op_ret, op_errno,
+                                             pre, post, xdata);
+        return 0;
+}
+
+
+int32_t
+dc_zerofill_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
+                 int32_t op_ret, int32_t op_errno, struct iatt *pre,
+                 struct iatt *post, dict_t *xdata)
+{
+        DC_FOP_RESPONSE_STORE_AND_WIND_NEXT (zerofill, frame, op_ret, op_errno,
+                                             pre, post, xdata);
+        return 0;
+}
+
+
+int32_t
+dc_ipc_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
+            int32_t op_ret, int32_t op_errno, dict_t *xdata)
+{
+        DC_FOP_RESPONSE_STORE_AND_WIND_NEXT (ipc, frame, op_ret, op_errno,
+                                             xdata);
+        return 0;
+}
+
+
+int32_t
+dc_seek_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
+             int32_t op_ret, int32_t op_errno, off_t offset, dict_t *xdata)
+{
+        DC_FOP_RESPONSE_STORE_AND_WIND_NEXT (seek, frame, op_ret, op_errno,
+                                             offset, xdata);
+        return 0;
+}
+
+int32_t
+dc_compound_fop_wind (call_frame_t *frame, xlator_t *this)
+{
+        dc_local_t              *local          = frame->local;
+        compound_args_t         *c_req          = local->compound_req;
+        compound_args_cbk_t     *c_rsp          = local->compound_rsp;
+        int                     counter         = local->counter;
+        default_args_t          curr_fop        = c_req->req_list[counter];
+        int                     op_ret          = 0;
+        int                     op_errno        = ENOMEM;
+
+        if (local->counter == local->length)
+                goto done;
+
+        switch (c_req->enum_list[counter]) {
+        case GF_FOP_STAT:
+                STACK_WIND (frame, dc_stat_cbk,
+                            FIRST_CHILD(this), FIRST_CHILD(this)->fops->stat,
+                            &curr_fop.loc, curr_fop.xdata);
+                break;
+        case GF_FOP_READLINK:
+                STACK_WIND (frame, dc_readlink_cbk,
+                            FIRST_CHILD(this),
+                            FIRST_CHILD(this)->fops->readlink,
+                            &curr_fop.loc, curr_fop.size,
+                            curr_fop.xdata);
+                break;
+        case GF_FOP_MKNOD:
+                STACK_WIND (frame, dc_mknod_cbk,
+                            FIRST_CHILD(this), FIRST_CHILD(this)->fops->mknod,
+                            &curr_fop.loc, curr_fop.mode, curr_fop.rdev,
+                            curr_fop.umask, curr_fop.xdata);
+                break;
+        case GF_FOP_MKDIR:
+                STACK_WIND (frame, dc_mkdir_cbk,
+                            FIRST_CHILD(this), FIRST_CHILD(this)->fops->mkdir,
+                            &curr_fop.loc, curr_fop.mode,
+                            curr_fop.umask, curr_fop.xdata);
+                break;
+        case GF_FOP_UNLINK:
+                STACK_WIND (frame, dc_unlink_cbk,
+                            FIRST_CHILD(this), FIRST_CHILD(this)->fops->unlink,
+                            &curr_fop.loc, curr_fop.xflag, curr_fop.xdata);
+                break;
+        case GF_FOP_RMDIR:
+                STACK_WIND (frame, dc_rmdir_cbk,
+                            FIRST_CHILD(this), FIRST_CHILD(this)->fops->rmdir,
+                            &curr_fop.loc, curr_fop.flags, curr_fop.xdata);
+                break;
+        case GF_FOP_SYMLINK:
+                STACK_WIND (frame, dc_symlink_cbk,
+                            FIRST_CHILD(this), FIRST_CHILD(this)->fops->symlink,
+                            curr_fop.linkname, &curr_fop.loc,
+                            curr_fop.umask, curr_fop.xdata);
+                break;
+        case GF_FOP_RENAME:
+                STACK_WIND (frame, dc_rename_cbk,
+                            FIRST_CHILD(this), FIRST_CHILD(this)->fops->rename,
+                            &curr_fop.loc, &curr_fop.loc2, curr_fop.xdata);
+                break;
+        case GF_FOP_LINK:
+                STACK_WIND (frame, dc_link_cbk,
+                            FIRST_CHILD(this), FIRST_CHILD(this)->fops->link,
+                            &curr_fop.loc, &curr_fop.loc2, curr_fop.xdata);
+                break;
+        case GF_FOP_TRUNCATE:
+                STACK_WIND (frame, dc_truncate_cbk,
+                            FIRST_CHILD(this),
+                            FIRST_CHILD(this)->fops->truncate,
+                            &curr_fop.loc, curr_fop.offset, curr_fop.xdata);
+                break;
+        case GF_FOP_OPEN:
+                STACK_WIND (frame, dc_open_cbk,
+                            FIRST_CHILD(this), FIRST_CHILD(this)->fops->open,
+                            &curr_fop.loc, curr_fop.flags, curr_fop.fd,
+                            curr_fop.xdata);
+                break;
+        case GF_FOP_READ:
+                STACK_WIND (frame, dc_readv_cbk,
+                            FIRST_CHILD(this), FIRST_CHILD(this)->fops->readv,
+                            curr_fop.fd, curr_fop.size, curr_fop.offset,
+                            curr_fop.flags, curr_fop.xdata);
+                break;
+        case GF_FOP_WRITE:
+                STACK_WIND (frame, dc_writev_cbk,
+                            FIRST_CHILD(this), FIRST_CHILD(this)->fops->writev,
+                            curr_fop.fd, curr_fop.vector, curr_fop.count,
+                            curr_fop.offset, curr_fop.flags, curr_fop.iobref,
+                            curr_fop.xdata);
+                break;
+        case GF_FOP_STATFS:
+                STACK_WIND (frame, dc_statfs_cbk,
+                            FIRST_CHILD(this), FIRST_CHILD(this)->fops->statfs,
+                            &curr_fop.loc, curr_fop.xdata);
+                break;
+        case GF_FOP_FLUSH:
+                STACK_WIND (frame, dc_flush_cbk,
+                            FIRST_CHILD(this), FIRST_CHILD(this)->fops->flush,
+                            curr_fop.fd, curr_fop.xdata);
+                break;
+        case GF_FOP_FSYNC:
+                STACK_WIND (frame, dc_fsync_cbk,
+                            FIRST_CHILD(this), FIRST_CHILD(this)->fops->fsync,
+                            curr_fop.fd, curr_fop.datasync, curr_fop.xdata);
+                break;
+        case GF_FOP_SETXATTR:
+                STACK_WIND (frame, dc_setxattr_cbk,
+                            FIRST_CHILD(this),
+                            FIRST_CHILD(this)->fops->setxattr,
+                            &curr_fop.loc, curr_fop.xattr, curr_fop.flags,
+                            curr_fop.xdata);
+                break;
+        case GF_FOP_GETXATTR:
+                STACK_WIND (frame, dc_getxattr_cbk,
+                            FIRST_CHILD(this),
+                            FIRST_CHILD(this)->fops->getxattr,
+                            &curr_fop.loc, curr_fop.name, curr_fop.xdata);
+                break;
+        case GF_FOP_REMOVEXATTR:
+                STACK_WIND (frame, dc_removexattr_cbk,
+                            FIRST_CHILD(this),
+                            FIRST_CHILD(this)->fops->removexattr,
+                            &curr_fop.loc, curr_fop.name, curr_fop.xdata);
+                break;
+        case GF_FOP_OPENDIR:
+                STACK_WIND (frame, dc_opendir_cbk,
+                            FIRST_CHILD(this),
+                            FIRST_CHILD(this)->fops->opendir,
+                            &curr_fop.loc, curr_fop.fd, curr_fop.xdata);
+                break;
+        case GF_FOP_FSYNCDIR:
+                STACK_WIND (frame, dc_fsyncdir_cbk,
+                            FIRST_CHILD(this),
+                            FIRST_CHILD(this)->fops->fsyncdir,
+                            curr_fop.fd, curr_fop.datasync, curr_fop.xdata);
+                break;
+        case GF_FOP_ACCESS:
+                STACK_WIND (frame, dc_access_cbk,
+                            FIRST_CHILD(this), FIRST_CHILD(this)->fops->access,
+                            &curr_fop.loc, curr_fop.mask, curr_fop.xdata);
+                break;
+        case GF_FOP_CREATE:
+                STACK_WIND (frame, dc_create_cbk,
+                            FIRST_CHILD(this), FIRST_CHILD(this)->fops->create,
+                            &curr_fop.loc, curr_fop.flags, curr_fop.mode,
+                            curr_fop.umask, curr_fop.fd, curr_fop.xdata);
+                break;
+        case GF_FOP_FTRUNCATE:
+                STACK_WIND (frame, dc_ftruncate_cbk,
+                            FIRST_CHILD(this),
+                            FIRST_CHILD(this)->fops->ftruncate,
+                            curr_fop.fd, curr_fop.offset, curr_fop.xdata);
+                break;
+        case GF_FOP_FSTAT:
+                STACK_WIND (frame, dc_fstat_cbk,
+                            FIRST_CHILD(this), FIRST_CHILD(this)->fops->fstat,
+                            curr_fop.fd, curr_fop.xdata);
+                break;
+        case GF_FOP_LK:
+                STACK_WIND (frame, dc_lk_cbk,
+                            FIRST_CHILD(this), FIRST_CHILD(this)->fops->lk,
+                            curr_fop.fd,
+                            curr_fop.cmd, &curr_fop.lock, curr_fop.xdata);
+                break;
+        case GF_FOP_LOOKUP:
+                STACK_WIND (frame, dc_lookup_cbk,
+                            FIRST_CHILD(this), FIRST_CHILD(this)->fops->lookup,
+                            &curr_fop.loc, curr_fop.xdata);
+                break;
+        case GF_FOP_READDIR:
+                STACK_WIND (frame, dc_readdir_cbk,
+                            FIRST_CHILD(this), FIRST_CHILD(this)->fops->readdir,
+                            curr_fop.fd, curr_fop.size, curr_fop.offset,
+                            curr_fop.xdata);
+                break;
+        case GF_FOP_INODELK:
+                STACK_WIND (frame, dc_inodelk_cbk,
+                            FIRST_CHILD(this), FIRST_CHILD(this)->fops->inodelk,
+                            curr_fop.volume, &curr_fop.loc,
+                            curr_fop.cmd, &curr_fop.lock, curr_fop.xdata);
+                break;
+        case GF_FOP_FINODELK:
+                STACK_WIND (frame, dc_finodelk_cbk,
+                            FIRST_CHILD(this),
+                            FIRST_CHILD(this)->fops->finodelk,
+                            curr_fop.volume, curr_fop.fd,
+                            curr_fop.cmd, &curr_fop.lock, curr_fop.xdata);
+                break;
+        case GF_FOP_ENTRYLK:
+                STACK_WIND (frame, dc_entrylk_cbk,
+                            FIRST_CHILD(this), FIRST_CHILD(this)->fops->entrylk,
+                            curr_fop.volume, &curr_fop.loc,
+                            curr_fop.name, curr_fop.entrylkcmd,
+                            curr_fop.entrylktype, curr_fop.xdata);
+                break;
+        case GF_FOP_FENTRYLK:
+                STACK_WIND (frame, dc_fentrylk_cbk,
+                            FIRST_CHILD(this),
+                            FIRST_CHILD(this)->fops->fentrylk,
+                            curr_fop.volume, curr_fop.fd,
+                            curr_fop.name, curr_fop.entrylkcmd,
+                            curr_fop.entrylktype, curr_fop.xdata);
+                break;
+        case GF_FOP_XATTROP:
+                STACK_WIND (frame, dc_xattrop_cbk,
+                            FIRST_CHILD(this),
+                            FIRST_CHILD(this)->fops->xattrop,
+                            &curr_fop.loc, curr_fop.optype, curr_fop.xattr,
+                            curr_fop.xdata);
+                break;
+        case GF_FOP_FXATTROP:
+                STACK_WIND (frame, dc_fxattrop_cbk,
+                            FIRST_CHILD(this),
+                            FIRST_CHILD(this)->fops->fxattrop,
+                            curr_fop.fd, curr_fop.optype, curr_fop.xattr,
+                            curr_fop.xdata);
+                break;
+        case GF_FOP_FGETXATTR:
+                STACK_WIND (frame, dc_fgetxattr_cbk,
+                            FIRST_CHILD(this),
+                            FIRST_CHILD(this)->fops->fgetxattr,
+                            curr_fop.fd, curr_fop.name, curr_fop.xdata);
+                break;
+        case GF_FOP_FSETXATTR:
+                STACK_WIND (frame, dc_fsetxattr_cbk,
+                            FIRST_CHILD(this),
+                            FIRST_CHILD(this)->fops->fsetxattr,
+                            curr_fop.fd, curr_fop.xattr, curr_fop.flags,
+                            curr_fop.xdata);
+                break;
+        case GF_FOP_RCHECKSUM:
+                STACK_WIND (frame, dc_rchecksum_cbk,
+                            FIRST_CHILD(this),
+                            FIRST_CHILD(this)->fops->rchecksum,
+                            curr_fop.fd, curr_fop.offset, curr_fop.size,
+                            curr_fop.xdata);
+                break;
+        case GF_FOP_SETATTR:
+                STACK_WIND (frame, dc_setattr_cbk,
+                            FIRST_CHILD(this), FIRST_CHILD(this)->fops->setattr,
+                            &curr_fop.loc, &curr_fop.stat, curr_fop.valid,
+                            curr_fop.xdata);
+                break;
+        case GF_FOP_FSETATTR:
+                STACK_WIND (frame, dc_fsetattr_cbk,
+                            FIRST_CHILD(this),
+                            FIRST_CHILD(this)->fops->fsetattr,
+                            curr_fop.fd, &curr_fop.stat, curr_fop.valid,
+                            curr_fop.xdata);
+                break;
+        case GF_FOP_READDIRP:
+                STACK_WIND (frame, dc_readdirp_cbk,
+                            FIRST_CHILD(this),
+                            FIRST_CHILD(this)->fops->readdirp,
+                            curr_fop.fd, curr_fop.size, curr_fop.offset,
+                            curr_fop.xdata);
+                break;
+        case GF_FOP_FREMOVEXATTR:
+                STACK_WIND (frame, dc_fremovexattr_cbk,
+                            FIRST_CHILD(this),
+                            FIRST_CHILD(this)->fops->fremovexattr,
+                            curr_fop.fd, curr_fop.name, curr_fop.xdata);
+                break;
+        case GF_FOP_FALLOCATE:
+                STACK_WIND (frame, dc_fallocate_cbk,
+                            FIRST_CHILD(this), FIRST_CHILD(this)->fops->fallocate,
+                            curr_fop.fd, curr_fop.flags, curr_fop.offset,
+                            curr_fop.size, curr_fop.xdata);
+                break;
+        case GF_FOP_DISCARD:
+                STACK_WIND (frame, dc_discard_cbk,
+                            FIRST_CHILD(this), FIRST_CHILD(this)->fops->discard,
+                            curr_fop.fd, curr_fop.offset, curr_fop.size,
+                            curr_fop.xdata);
+                break;
+        case GF_FOP_ZEROFILL:
+                STACK_WIND (frame, dc_zerofill_cbk,
+                            FIRST_CHILD(this), FIRST_CHILD(this)->fops->zerofill,
+                            curr_fop.fd, curr_fop.offset, curr_fop.size,
+                            curr_fop.xdata);
+                break;
+        case GF_FOP_IPC:
+                STACK_WIND (frame, dc_ipc_cbk,
+                            FIRST_CHILD(this), FIRST_CHILD(this)->fops->ipc,
+                            curr_fop.cmd, curr_fop.xdata);
+                break;
+        case GF_FOP_SEEK:
+                STACK_WIND (frame, dc_seek_cbk,
+                            FIRST_CHILD(this), FIRST_CHILD(this)->fops->seek,
+                            curr_fop.fd, curr_fop.offset, curr_fop.what,
+                            curr_fop.xdata);
+                break;
+        default:
+                return -ENOTSUP;
+        }
+        return 0;
+done:
+        DC_STACK_UNWIND (frame, op_ret, op_errno, c_rsp, NULL);
+        return 0;
+}
+
+int32_t
+dc_compound (call_frame_t *frame, xlator_t *this, void *data, dict_t *xdata)
+{
+        compound_args_t         *compound_req = NULL;
+        compound_args_cbk_t     *compound_rsp = NULL;
+        int                     ret           = 0;
+        int                     op_errno      = ENOMEM;
+        dc_local_t              *local        = NULL;
+
+        compound_req = data;
+
+        GF_ASSERT_AND_GOTO_WITH_ERROR (this, compound_req, out, op_errno,
+                                       EINVAL);
+
+        local = mem_get0 (this->local_pool);
+        if (!local)
+                goto out;
+
+        frame->local = local;
+
+        local->compound_rsp = GF_CALLOC (1, sizeof (local->compound_rsp),
+                                         gf_dc_mt_rsp_t);
+        if (!local->compound_rsp)
+                goto out;
+
+        compound_rsp = local->compound_rsp;
+
+        compound_rsp->fop_length = compound_req->fop_length;
+        compound_rsp->rsp_list = GF_CALLOC (compound_rsp->fop_length,
+                                            sizeof (default_args_cbk_t),
+                                            gf_mt_default_args_cbk_t);
+        if (!compound_rsp->rsp_list)
+                goto out;
+
+        local->length =  compound_req->fop_length;
+        local->counter = 0;
+        local->compound_req = compound_req;
+
+        if (!local->length) {
+                op_errno = EINVAL;
+                goto out;
+        }
+
+        ret = dc_compound_fop_wind (frame, this);
+        if (ret < 0) {
+                op_errno = -ret;
+                goto out;
+        }
+        return 0;
+out:
+        DC_STACK_UNWIND (frame, -1, op_errno, compound_rsp, NULL);
+        return 0;
+}
+
+struct xlator_fops fops = {
+        .compound = dc_compound,
+};
+
+int32_t
+mem_acct_init (xlator_t *this)
+{
+        int     ret = -1;
+
+        if (!this)
+                return ret;
+
+        ret = xlator_mem_acct_init (this, gf_dc_mt_end + 1);
+
+        return ret;
+}
+
+int32_t
+init (xlator_t *this)
+{
+        int     ret = 0;
+
+        if (!this->children) {
+                gf_msg (this->name, GF_LOG_WARNING, 0,
+                        DC_MSG_VOL_MISCONFIGURED, "Decompounder must have"
+                        " a subvol.");
+                ret = -1;
+                goto out;
+        }
+
+        if (!this->parents) {
+                gf_msg (this->name, GF_LOG_WARNING, 0,
+                        DC_MSG_VOL_MISCONFIGURED, "Volume is dangling.");
+                ret = -1;
+                goto out;
+        }
+out:
+        return ret;
+}
+
+int32_t
+fini (xlator_t *this)
+{
+        return 0;
+}
diff --git a/xlators/performance/decompounder/src/decompounder.h b/xlators/performance/decompounder/src/decompounder.h
new file mode 100644
index 00000000000..1b8c1d6d00f
--- /dev/null
+++ b/xlators/performance/decompounder/src/decompounder.h
@@ -0,0 +1,74 @@
+/*
+  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.
+*/
+
+#ifndef __DC_H__
+#define __DC_H__
+
+#include "defaults.h"
+#include "xlator.h"
+#include "call-stub.h"
+#include "decompounder-mem-types.h"
+#include "decompounder-messages.h"
+
+typedef struct {
+        compound_args_t *compound_req;
+        compound_args_cbk_t *compound_rsp;
+        int     counter;
+        int     length;
+} dc_local_t;
+
+#define DC_STACK_UNWIND(frame, op_ret, op_errno, rsp, xdata) do {\
+                dc_local_t      *__local = NULL;                      \
+                if (frame) {                                          \
+                        __local = frame->local;                       \
+                        frame->local = NULL;                          \
+                }                                                     \
+                STACK_UNWIND_STRICT (compound, frame, op_ret, op_errno,    \
+                                     (void *)rsp, xdata);             \
+                if (__local) {                                        \
+                        dc_local_cleanup (__local);                   \
+                        mem_put (__local);                            \
+                }                                                     \
+        } while (0)
+
+int32_t
+dc_compound_fop_wind (call_frame_t *frame, xlator_t *this);
+
+void
+dc_local_cleanup (dc_local_t *local);
+
+#define DC_FOP_RESPONSE_STORE_AND_WIND_NEXT(fop, frame, op_ret, op_errno, params ...) do {      \
+        dc_local_t              *__local        = frame->local;                                 \
+        xlator_t                *__this         = frame->this;                                  \
+        int                     __ret           = 0;                                            \
+        int                     __counter       = __local->counter;                             \
+        compound_args_cbk_t     *__compound_rsp = __local->compound_rsp;                        \
+        default_args_cbk_t      *__fop_rsp      = &__local->compound_rsp->rsp_list[__counter];  \
+                                                                                                \
+        if (op_ret < 0) {                                                               \
+                gf_msg (__this->name, GF_LOG_ERROR, op_errno, DC_MSG_ERROR_RECEIVED,    \
+                        "fop number %d failed. Unwinding.", __counter+1);               \
+                args_##fop##_cbk_store (__fop_rsp,                                      \
+                                        op_ret, op_errno, params);                      \
+                /*TODO : Fill the rest of the responses to -1 or NULL*/                 \
+                DC_STACK_UNWIND (frame, op_ret, op_errno,                     \
+                                 (void *)__compound_rsp, NULL);                         \
+        } else {                                                                        \
+                args_##fop##_cbk_store (__fop_rsp,                                      \
+                                        op_ret, op_errno, params);                      \
+                __local->counter++;                                                     \
+                __ret = dc_compound_fop_wind (frame, __this);                           \
+                if (__ret < 0) {                                                        \
+                        DC_STACK_UNWIND (frame, -1, -__ret,                   \
+                                         (void *)__compound_rsp, NULL);                 \
+                }                                                                       \
+        }                                                                               \
+        } while (0)
+#endif /* DC_H__ */