Global: NFS-friendly prototype changes

Signed-off-by: Anand V. Avati <avati@dev.gluster.com>

BUG: 145 (NFSv3 related additions to 2.1 task list)
URL: http://bugs.gluster.com/cgi-bin/bugzilla3/show_bug.cgi?id=145

6 files changed, 399 insertions, 117 deletions

diff --git a/libglusterfs/src/call-stub.c b/libglusterfs/src/call-stub.c
index 89a212807..bc7d556c2 100644
--- a/libglusterfs/src/call-stub.c
+++ b/libglusterfs/src/call-stub.c
@@ -82,7 +82,8 @@ fop_lookup_cbk_stub (call_frame_t *frame,
 		     int32_t op_errno,
 		     inode_t *inode,
 		     struct stat *buf,
-		     dict_t *dict)
+                     dict_t *dict,
+                     struct stat *postparent)
 {
 	call_stub_t *stub = NULL;
 
@@ -100,6 +101,8 @@ fop_lookup_cbk_stub (call_frame_t *frame,
 		stub->args.lookup_cbk.buf = *buf;
 	if (dict)
 		stub->args.lookup_cbk.dict = dict_ref (dict);
+        if (postparent)
+                stub->args.lookup_cbk.postparent = *postparent;
 out:
 	return stub;
 }
@@ -412,7 +415,8 @@ fop_truncate_cbk_stub (call_frame_t *frame,
 		       fop_truncate_cbk_t fn,
 		       int32_t op_ret,
 		       int32_t op_errno,
-		       struct stat *buf)
+		       struct stat *prebuf,
+                       struct stat *postbuf)
 {
 	call_stub_t *stub = NULL;
 
@@ -424,8 +428,10 @@ fop_truncate_cbk_stub (call_frame_t *frame,
 	stub->args.truncate_cbk.fn = fn;
 	stub->args.truncate_cbk.op_ret = op_ret;
 	stub->args.truncate_cbk.op_errno = op_errno;
-	if (buf)
-		stub->args.truncate_cbk.buf = *buf;
+	if (prebuf)
+		stub->args.truncate_cbk.prebuf = *prebuf;
+        if (postbuf)
+                stub->args.truncate_cbk.postbuf = *postbuf;
 out:
 	return stub;
 }
@@ -459,7 +465,8 @@ fop_ftruncate_cbk_stub (call_frame_t *frame,
 			fop_ftruncate_cbk_t fn,
 			int32_t op_ret,
 			int32_t op_errno,
-			struct stat *buf)
+			struct stat *prebuf,
+                        struct stat *postbuf)
 {
 	call_stub_t *stub = NULL;
 
@@ -471,8 +478,10 @@ fop_ftruncate_cbk_stub (call_frame_t *frame,
 	stub->args.ftruncate_cbk.fn = fn;
 	stub->args.ftruncate_cbk.op_ret = op_ret;
 	stub->args.ftruncate_cbk.op_errno = op_errno;
-	if (buf)
-		stub->args.ftruncate_cbk.buf = *buf;
+	if (prebuf)
+		stub->args.ftruncate_cbk.prebuf = *prebuf;
+	if (postbuf)
+		stub->args.ftruncate_cbk.postbuf = *postbuf;
 out:
 	return stub;
 }
@@ -595,7 +604,8 @@ fop_readlink_cbk_stub (call_frame_t *frame,
 		       fop_readlink_cbk_t fn,
 		       int32_t op_ret,
 		       int32_t op_errno,
-		       const char *path)
+		       const char *path,
+                       struct stat *sbuf)
 {
 	call_stub_t *stub = NULL;
 
@@ -609,6 +619,8 @@ fop_readlink_cbk_stub (call_frame_t *frame,
 	stub->args.readlink_cbk.op_errno = op_errno;
 	if (path)
 		stub->args.readlink_cbk.buf = strdup (path);
+        if (sbuf)
+                stub->args.readlink_cbk.sbuf = *sbuf;
 out:
 	return stub;
 }
@@ -644,7 +656,9 @@ fop_mknod_cbk_stub (call_frame_t *frame,
 		    int32_t op_ret,
 		    int32_t op_errno,
 		    inode_t *inode,
-		    struct stat *buf)
+                    struct stat *buf,
+                    struct stat *preparent,
+                    struct stat *postparent)
 {
 	call_stub_t *stub = NULL;
 
@@ -660,6 +674,10 @@ fop_mknod_cbk_stub (call_frame_t *frame,
 		stub->args.mknod_cbk.inode = inode_ref (inode);
 	if (buf)
 		stub->args.mknod_cbk.buf = *buf;
+        if (preparent)
+                stub->args.mknod_cbk.preparent = *preparent;
+        if (postparent)
+                stub->args.mknod_cbk.postparent = *postparent;
 out:
 	return stub;
 }
@@ -693,7 +711,9 @@ fop_mkdir_cbk_stub (call_frame_t *frame,
 		    int32_t op_ret,
 		    int32_t op_errno,
 		    inode_t *inode,
-		    struct stat *buf)
+                    struct stat *buf,
+                    struct stat *preparent,
+                    struct stat *postparent)
 {
 	call_stub_t *stub = NULL;
 
@@ -709,6 +729,10 @@ fop_mkdir_cbk_stub (call_frame_t *frame,
 		stub->args.mkdir_cbk.inode = inode_ref (inode);
 	if (buf)
 		stub->args.mkdir_cbk.buf = *buf;
+        if (preparent)
+                stub->args.mkdir_cbk.preparent = *preparent;
+        if (postparent)
+                stub->args.mkdir_cbk.postparent = *postparent;
 out:
 	return stub;
 }
@@ -738,7 +762,9 @@ call_stub_t *
 fop_unlink_cbk_stub (call_frame_t *frame,
 		     fop_unlink_cbk_t fn,
 		     int32_t op_ret,
-		     int32_t op_errno)
+		     int32_t op_errno,
+                     struct stat *preparent,
+                     struct stat *postparent)
 {
 	call_stub_t *stub = NULL;
 
@@ -750,6 +776,10 @@ fop_unlink_cbk_stub (call_frame_t *frame,
 	stub->args.unlink_cbk.fn = fn;
 	stub->args.unlink_cbk.op_ret = op_ret;
 	stub->args.unlink_cbk.op_errno = op_errno;
+        if (preparent)
+                stub->args.unlink_cbk.preparent = *preparent;
+        if (postparent)
+                stub->args.unlink_cbk.postparent = *postparent;
 out:
 	return stub;
 }
@@ -780,7 +810,9 @@ call_stub_t *
 fop_rmdir_cbk_stub (call_frame_t *frame,
 		    fop_rmdir_cbk_t fn,
 		    int32_t op_ret,
-		    int32_t op_errno)
+		    int32_t op_errno,
+                    struct stat *preparent,
+                    struct stat *postparent)
 {
 	call_stub_t *stub = NULL;
 
@@ -792,6 +824,10 @@ fop_rmdir_cbk_stub (call_frame_t *frame,
 	stub->args.rmdir_cbk.fn = fn;
 	stub->args.rmdir_cbk.op_ret = op_ret;
 	stub->args.rmdir_cbk.op_errno = op_errno;
+        if (preparent)
+                stub->args.rmdir_cbk.preparent = *preparent;
+        if (postparent)
+                stub->args.rmdir_cbk.postparent = *postparent;
 out:
 	return stub;
 }
@@ -826,7 +862,9 @@ fop_symlink_cbk_stub (call_frame_t *frame,
 		      int32_t op_ret,
 		      int32_t op_errno,
 		      inode_t *inode,
-		      struct stat *buf)
+                      struct stat *buf,
+                      struct stat *preparent,
+                      struct stat *postparent)
 {
 	call_stub_t *stub = NULL;
 
@@ -842,6 +880,10 @@ fop_symlink_cbk_stub (call_frame_t *frame,
 		stub->args.symlink_cbk.inode = inode_ref (inode);
 	if (buf)
 		stub->args.symlink_cbk.buf = *buf;
+        if (preparent)
+                stub->args.symlink_cbk.preparent = *preparent;
+        if (postparent)
+                stub->args.symlink_cbk.postparent = *postparent;
 out:
 	return stub;
 }
@@ -875,7 +917,11 @@ fop_rename_cbk_stub (call_frame_t *frame,
 		     fop_rename_cbk_t fn,
 		     int32_t op_ret,
 		     int32_t op_errno,
-		     struct stat *buf)
+		     struct stat *buf,
+                     struct stat *preoldparent,
+                     struct stat *postoldparent,
+                     struct stat *prenewparent,
+                     struct stat *postnewparent)
 {
 	call_stub_t *stub = NULL;
 
@@ -889,6 +935,14 @@ fop_rename_cbk_stub (call_frame_t *frame,
 	stub->args.rename_cbk.op_errno = op_errno;
 	if (buf)
 		stub->args.rename_cbk.buf = *buf;
+        if (preoldparent)
+                stub->args.rename_cbk.preoldparent = *preoldparent;
+        if (postoldparent)
+                stub->args.rename_cbk.postoldparent = *postoldparent;
+        if (prenewparent)
+                stub->args.rename_cbk.prenewparent = *prenewparent;
+        if (postnewparent)
+                stub->args.rename_cbk.postnewparent = *postnewparent;
 out:
 	return stub;
 }
@@ -924,7 +978,9 @@ fop_link_cbk_stub (call_frame_t *frame,
 		   int32_t op_ret,
 		   int32_t op_errno,
 		   inode_t *inode,
-		   struct stat *buf)
+                   struct stat *buf,
+                   struct stat *preparent,
+                   struct stat *postparent)
 {
 	call_stub_t *stub = NULL;
 
@@ -940,6 +996,10 @@ fop_link_cbk_stub (call_frame_t *frame,
 		stub->args.link_cbk.inode = inode_ref (inode);
 	if (buf)
 		stub->args.link_cbk.buf = *buf;
+        if (preparent)
+                stub->args.link_cbk.preparent = *preparent;
+        if (postparent)
+                stub->args.link_cbk.postparent = *postparent;
 out:
 	return stub;
 }
@@ -978,7 +1038,9 @@ fop_create_cbk_stub (call_frame_t *frame,
 		     int32_t op_errno,
 		     fd_t *fd,
 		     inode_t *inode,
-		     struct stat *buf)
+		     struct stat *buf,
+                     struct stat *preparent,
+                     struct stat *postparent)
 {
 	call_stub_t *stub = NULL;
 
@@ -996,6 +1058,10 @@ fop_create_cbk_stub (call_frame_t *frame,
 		stub->args.create_cbk.inode = inode_ref (inode);
 	if (buf)
 		stub->args.create_cbk.buf = *buf;
+        if (preparent)
+                stub->args.create_cbk.preparent = *preparent;
+        if (postparent)
+                stub->args.create_cbk.postparent = *postparent;
 out:
 	return stub;
 }
@@ -1005,7 +1071,8 @@ call_stub_t *
 fop_open_stub (call_frame_t *frame,
 	       fop_open_t fn,
 	       loc_t *loc,
-	       int32_t flags, fd_t *fd)
+	       int32_t flags, fd_t *fd,
+               int32_t wbflags)
 {
 	call_stub_t *stub = NULL;
 
@@ -1018,6 +1085,7 @@ fop_open_stub (call_frame_t *frame,
 	stub->args.open.fn = fn;
 	loc_copy (&stub->args.open.loc, loc);
 	stub->args.open.flags = flags;
+        stub->args.open.wbflags = wbflags;
 	if (fd)
 		stub->args.open.fd = fd_ref (fd);
 out:
@@ -1140,7 +1208,8 @@ fop_writev_cbk_stub (call_frame_t *frame,
 		     fop_writev_cbk_t fn,
 		     int32_t op_ret,
 		     int32_t op_errno,
-		     struct stat *stbuf)
+                     struct stat *prebuf,
+		     struct stat *postbuf)
 
 {
 	call_stub_t *stub = NULL;
@@ -1154,7 +1223,9 @@ fop_writev_cbk_stub (call_frame_t *frame,
 	stub->args.writev_cbk.op_ret = op_ret;
 	stub->args.writev_cbk.op_errno = op_errno;
 	if (op_ret >= 0)
-		stub->args.writev_cbk.stbuf = *stbuf;
+		stub->args.writev_cbk.postbuf = *postbuf;
+        if (prebuf)
+                stub->args.writev_cbk.prebuf = *prebuf;
 out:
 	return stub;
 }
@@ -1231,8 +1302,9 @@ call_stub_t *
 fop_fsync_cbk_stub (call_frame_t *frame,
 		    fop_fsync_cbk_t fn,
 		    int32_t op_ret,
-		    int32_t op_errno)
-
+		    int32_t op_errno,
+                    struct stat *prebuf,
+                    struct stat *postbuf)
 {
 	call_stub_t *stub = NULL;
 
@@ -1244,6 +1316,10 @@ fop_fsync_cbk_stub (call_frame_t *frame,
 	stub->args.fsync_cbk.fn = fn;
 	stub->args.fsync_cbk.op_ret = op_ret;
 	stub->args.fsync_cbk.op_errno = op_errno;
+        if (prebuf)
+                stub->args.fsync_cbk.prebuf = *prebuf;
+        if (postbuf)
+                stub->args.fsync_cbk.postbuf = *postbuf;
 out:
 	return stub;
 }
@@ -2459,7 +2535,8 @@ call_resume_wind (call_stub_t *stub)
 		stub->args.open.fn (stub->frame, 
 				    stub->frame->this,
 				    &stub->args.open.loc, 
-				    stub->args.open.flags, stub->args.open.fd);
+				    stub->args.open.flags, stub->args.open.fd,
+                                    stub->args.open.wbflags);
 		break;
 	}
 	case GF_FOP_CREATE:
@@ -2958,7 +3035,9 @@ call_resume_unwind (call_stub_t *stub)
 				      stub->args.create_cbk.op_errno,
 				      stub->args.create_cbk.fd,
 				      stub->args.create_cbk.inode,
-				      &stub->args.create_cbk.buf);
+				      &stub->args.create_cbk.buf,
+                                      &stub->args.create_cbk.preparent,
+                                      &stub->args.create_cbk.postparent);
 		else
 			stub->args.create_cbk.fn (stub->frame,
 						  stub->frame->cookie,
@@ -2967,7 +3046,9 @@ call_resume_unwind (call_stub_t *stub)
 						  stub->args.create_cbk.op_errno,
 						  stub->args.create_cbk.fd,
 						  stub->args.create_cbk.inode,
-						  &stub->args.create_cbk.buf);
+						  &stub->args.create_cbk.buf,
+                                                  &stub->args.create_cbk.preparent,
+                                                  &stub->args.create_cbk.postparent);
       
 		break;
 	}
@@ -2996,14 +3077,16 @@ call_resume_unwind (call_stub_t *stub)
 			STACK_UNWIND (stub->frame,
 				      stub->args.readlink_cbk.op_ret,
 				      stub->args.readlink_cbk.op_errno,
-				      stub->args.readlink_cbk.buf);
+				      stub->args.readlink_cbk.buf,
+                                      &stub->args.readlink_cbk.sbuf);
 		else
 			stub->args.readlink_cbk.fn (stub->frame,
 						    stub->frame->cookie,
 						    stub->frame->this,
 						    stub->args.readlink_cbk.op_ret,
 						    stub->args.readlink_cbk.op_errno,
-						    stub->args.readlink_cbk.buf);
+						    stub->args.readlink_cbk.buf,
+                                                    &stub->args.readlink_cbk.sbuf);
 
 		break;
 	}
@@ -3015,7 +3098,9 @@ call_resume_unwind (call_stub_t *stub)
 				      stub->args.mknod_cbk.op_ret,
 				      stub->args.mknod_cbk.op_errno,
 				      stub->args.mknod_cbk.inode,
-				      &stub->args.mknod_cbk.buf);
+                                      &stub->args.mknod_cbk.buf,
+                                      &stub->args.mknod_cbk.preparent,
+                                      &stub->args.mknod_cbk.postparent);
 		else
 			stub->args.mknod_cbk.fn (stub->frame,
 						 stub->frame->cookie,
@@ -3023,7 +3108,9 @@ call_resume_unwind (call_stub_t *stub)
 						 stub->args.mknod_cbk.op_ret,
 						 stub->args.mknod_cbk.op_errno,
 						 stub->args.mknod_cbk.inode,
-						 &stub->args.mknod_cbk.buf);
+                                                 &stub->args.mknod_cbk.buf,
+                                                 &stub->args.mknod_cbk.preparent,
+                                                 &stub->args.mknod_cbk.postparent);
 		break;
 	}
 
@@ -3034,7 +3121,9 @@ call_resume_unwind (call_stub_t *stub)
 				      stub->args.mkdir_cbk.op_ret,
 				      stub->args.mkdir_cbk.op_errno,
 				      stub->args.mkdir_cbk.inode,
-				      &stub->args.mkdir_cbk.buf);
+                                      &stub->args.mkdir_cbk.buf,
+                                      &stub->args.mkdir_cbk.preparent,
+                                      &stub->args.mkdir_cbk.postparent);
 		else
 			stub->args.mkdir_cbk.fn (stub->frame,
 						 stub->frame->cookie,
@@ -3042,7 +3131,9 @@ call_resume_unwind (call_stub_t *stub)
 						 stub->args.mkdir_cbk.op_ret,
 						 stub->args.mkdir_cbk.op_errno,
 						 stub->args.mkdir_cbk.inode,
-						 &stub->args.mkdir_cbk.buf);
+                                                 &stub->args.mkdir_cbk.buf,
+                                                 &stub->args.mkdir_cbk.preparent,
+                                                 &stub->args.mkdir_cbk.postparent);
 
 		if (stub->args.mkdir_cbk.inode)
 			inode_unref (stub->args.mkdir_cbk.inode);
@@ -3055,13 +3146,17 @@ call_resume_unwind (call_stub_t *stub)
 		if (!stub->args.unlink_cbk.fn)
 			STACK_UNWIND (stub->frame,
 				      stub->args.unlink_cbk.op_ret,
-				      stub->args.unlink_cbk.op_errno);
+				      stub->args.unlink_cbk.op_errno,
+                                      &stub->args.unlink_cbk.preparent,
+                                      &stub->args.unlink_cbk.postparent);
 		else
 			stub->args.unlink_cbk.fn (stub->frame,
 						  stub->frame->cookie,
 						  stub->frame->this,
 						  stub->args.unlink_cbk.op_ret,
-						  stub->args.unlink_cbk.op_errno);
+						  stub->args.unlink_cbk.op_errno,
+                                                  &stub->args.unlink_cbk.preparent,
+                                                  &stub->args.unlink_cbk.postparent);
 		break;
 	}
   
@@ -3070,13 +3165,17 @@ call_resume_unwind (call_stub_t *stub)
 		if (!stub->args.rmdir_cbk.fn)
 			STACK_UNWIND (stub->frame,
 				      stub->args.rmdir_cbk.op_ret,
-				      stub->args.rmdir_cbk.op_errno);
+				      stub->args.rmdir_cbk.op_errno,
+                                      &stub->args.rmdir_cbk.preparent,
+                                      &stub->args.rmdir_cbk.postparent);
 		else
 			stub->args.unlink_cbk.fn (stub->frame,
 						  stub->frame->cookie,
 						  stub->frame->this,
 						  stub->args.rmdir_cbk.op_ret,
-						  stub->args.rmdir_cbk.op_errno);
+						  stub->args.rmdir_cbk.op_errno,
+                                                  &stub->args.rmdir_cbk.preparent,
+                                                  &stub->args.rmdir_cbk.postparent);
 		break;
 	}
 
@@ -3087,7 +3186,9 @@ call_resume_unwind (call_stub_t *stub)
 				      stub->args.symlink_cbk.op_ret,
 				      stub->args.symlink_cbk.op_errno,
 				      stub->args.symlink_cbk.inode,
-				      &stub->args.symlink_cbk.buf);
+                                      &stub->args.symlink_cbk.buf,
+                                      &stub->args.symlink_cbk.preparent,
+                                      &stub->args.symlink_cbk.postparent);
 		else
 			stub->args.symlink_cbk.fn (stub->frame,
 						   stub->frame->cookie,
@@ -3095,7 +3196,9 @@ call_resume_unwind (call_stub_t *stub)
 						   stub->args.symlink_cbk.op_ret,
 						   stub->args.symlink_cbk.op_errno,
 						   stub->args.symlink_cbk.inode,
-						   &stub->args.symlink_cbk.buf);
+                                                   &stub->args.symlink_cbk.buf,
+                                                   &stub->args.symlink_cbk.preparent,
+                                                   &stub->args.symlink_cbk.postparent);
 	}
 	break;
   
@@ -3106,14 +3209,22 @@ call_resume_unwind (call_stub_t *stub)
 			STACK_UNWIND (stub->frame,
 				      stub->args.rename_cbk.op_ret,
 				      stub->args.rename_cbk.op_errno,
-				      &stub->args.rename_cbk.buf);
+				      &stub->args.rename_cbk.buf,
+                                      &stub->args.rename_cbk.preoldparent,
+                                      &stub->args.rename_cbk.postoldparent,
+                                      &stub->args.rename_cbk.prenewparent,
+                                      &stub->args.rename_cbk.postnewparent);
 		else
 			stub->args.rename_cbk.fn (stub->frame,
 						  stub->frame->cookie,
 						  stub->frame->this,
 						  stub->args.rename_cbk.op_ret,
 						  stub->args.rename_cbk.op_errno,
-						  &stub->args.rename_cbk.buf);
+						  &stub->args.rename_cbk.buf,
+                                                  &stub->args.rename_cbk.preoldparent,
+                                                  &stub->args.rename_cbk.postoldparent,
+                                                  &stub->args.rename_cbk.prenewparent,
+                                                  &stub->args.rename_cbk.postnewparent);
 #endif
 		break;
 	}
@@ -3133,7 +3244,9 @@ call_resume_unwind (call_stub_t *stub)
 						stub->args.link_cbk.op_ret,
 						stub->args.link_cbk.op_errno,
 						stub->args.link_cbk.inode,
-						&stub->args.link_cbk.buf);
+                                                &stub->args.link_cbk.buf,
+                                                &stub->args.link_cbk.preparent,
+                                                &stub->args.link_cbk.postparent);
 		break;
 	}
   
@@ -3177,14 +3290,16 @@ call_resume_unwind (call_stub_t *stub)
 			STACK_UNWIND (stub->frame,
 				      stub->args.truncate_cbk.op_ret,
 				      stub->args.truncate_cbk.op_errno,
-				      &stub->args.truncate_cbk.buf);
+				      &stub->args.truncate_cbk.prebuf,
+                                      &stub->args.truncate_cbk.postbuf);
 		else
 			stub->args.truncate_cbk.fn (stub->frame,
 						    stub->frame->cookie,
 						    stub->frame->this,
 						    stub->args.truncate_cbk.op_ret,
 						    stub->args.truncate_cbk.op_errno,
-						    &stub->args.truncate_cbk.buf);
+						    &stub->args.truncate_cbk.prebuf,
+                                                    &stub->args.truncate_cbk.postbuf);
 		break;
 	}
       
@@ -3217,14 +3332,16 @@ call_resume_unwind (call_stub_t *stub)
 			STACK_UNWIND (stub->frame,
 				      stub->args.writev_cbk.op_ret,
 				      stub->args.writev_cbk.op_errno,
-				      &stub->args.writev_cbk.stbuf);
+                                      &stub->args.writev_cbk.prebuf,
+				      &stub->args.writev_cbk.postbuf);
 		else
 			stub->args.writev_cbk.fn (stub->frame,
 						  stub->frame->cookie,
 						  stub->frame->this,
 						  stub->args.writev_cbk.op_ret,
 						  stub->args.writev_cbk.op_errno,
-						  &stub->args.writev_cbk.stbuf);
+                                                  &stub->args.writev_cbk.prebuf,
+						  &stub->args.writev_cbk.postbuf);
 		break;
 	}
   
@@ -3266,13 +3383,17 @@ call_resume_unwind (call_stub_t *stub)
 		if (!stub->args.fsync_cbk.fn)
 			STACK_UNWIND (stub->frame,
 				      stub->args.fsync_cbk.op_ret,
-				      stub->args.fsync_cbk.op_errno);
+				      stub->args.fsync_cbk.op_errno,
+                                      &stub->args.fsync_cbk.prebuf,
+                                      &stub->args.fsync_cbk.postbuf);
 		else
 			stub->args.fsync_cbk.fn (stub->frame,
 						 stub->frame->cookie,
 						 stub->frame->this,
 						 stub->args.fsync_cbk.op_ret,
-						 stub->args.fsync_cbk.op_errno);
+						 stub->args.fsync_cbk.op_errno,
+                                                 &stub->args.fsync_cbk.prebuf,
+                                                 &stub->args.fsync_cbk.postbuf);
 		break;
 	}
   
@@ -3433,14 +3554,16 @@ call_resume_unwind (call_stub_t *stub)
 			STACK_UNWIND (stub->frame,
 				      stub->args.ftruncate_cbk.op_ret,
 				      stub->args.ftruncate_cbk.op_errno,
-				      &stub->args.ftruncate_cbk.buf);
+				      &stub->args.ftruncate_cbk.prebuf,
+				      &stub->args.ftruncate_cbk.postbuf);
 		else
 			stub->args.ftruncate_cbk.fn (stub->frame,
 						     stub->frame->cookie,
 						     stub->frame->this,
 						     stub->args.ftruncate_cbk.op_ret,
 						     stub->args.ftruncate_cbk.op_errno,
-						     &stub->args.ftruncate_cbk.buf);
+						     &stub->args.ftruncate_cbk.prebuf,
+						     &stub->args.ftruncate_cbk.postbuf);
 		break;
 	}
   
@@ -3605,7 +3728,8 @@ call_resume_unwind (call_stub_t *stub)
 				      stub->args.lookup_cbk.op_errno,
 				      stub->args.lookup_cbk.inode,
 				      &stub->args.lookup_cbk.buf,
-				      stub->args.lookup_cbk.dict);
+                                      stub->args.lookup_cbk.dict,
+                                      &stub->args.lookup_cbk.postparent);
 		else
 			stub->args.lookup_cbk.fn (stub->frame, 
 						  stub->frame->cookie,
@@ -3613,8 +3737,9 @@ call_resume_unwind (call_stub_t *stub)
 						  stub->args.lookup_cbk.op_ret,
 						  stub->args.lookup_cbk.op_errno,
 						  stub->args.lookup_cbk.inode,
-						  &stub->args.lookup_cbk.buf, 
-						  stub->args.lookup_cbk.dict);
+                                                  &stub->args.lookup_cbk.buf,
+                                                  stub->args.lookup_cbk.dict,
+                                                  &stub->args.lookup_cbk.postparent);
 		/* FIXME NULL should not be passed */
 
 		if (stub->args.lookup_cbk.dict)
diff --git a/libglusterfs/src/call-stub.h b/libglusterfs/src/call-stub.h
index 63439478c..88e26c24f 100644
--- a/libglusterfs/src/call-stub.h
+++ b/libglusterfs/src/call-stub.h
@@ -48,6 +48,7 @@ typedef struct {
 			inode_t *inode;
 			struct stat buf;
 			dict_t *dict;
+                        struct stat postparent;
 		} lookup_cbk;
 
 		/* stat */
@@ -131,7 +132,8 @@ typedef struct {
 		struct {
 			fop_truncate_cbk_t fn;
 			int32_t op_ret, op_errno;
-			struct stat buf;
+			struct stat prebuf;
+                        struct stat postbuf;
 		} truncate_cbk;
 
 		/* ftruncate */
@@ -143,7 +145,8 @@ typedef struct {
 		struct {
 			fop_ftruncate_cbk_t fn;
 			int32_t op_ret, op_errno;
-			struct stat buf;
+			struct stat prebuf;
+                        struct stat postbuf;
 		} ftruncate_cbk;
 
 		/* utimens */
@@ -179,6 +182,7 @@ typedef struct {
 			fop_readlink_cbk_t fn;
 			int32_t op_ret, op_errno;
 			const char *buf;
+                        struct stat sbuf;
 		} readlink_cbk;
 
 		/* mknod */
@@ -193,6 +197,8 @@ typedef struct {
 			int32_t op_ret, op_errno;
 			inode_t *inode;
 			struct stat buf;
+                        struct stat preparent;
+                        struct stat postparent;
 		} mknod_cbk;
 
 		/* mkdir */
@@ -206,6 +212,8 @@ typedef struct {
 			int32_t op_ret, op_errno;
 			inode_t *inode;
 			struct stat buf;
+                        struct stat preparent;
+                        struct stat postparent;
 		} mkdir_cbk;
 
 		/* unlink */
@@ -216,6 +224,8 @@ typedef struct {
 		struct {
 			fop_unlink_cbk_t fn;
 			int32_t op_ret, op_errno;
+                        struct stat preparent;
+                        struct stat postparent;
 		} unlink_cbk;
 
 		/* rmdir */
@@ -226,6 +236,8 @@ typedef struct {
 		struct {
 			fop_rmdir_cbk_t fn;
 			int32_t op_ret, op_errno;
+                        struct stat preparent;
+                        struct stat postparent;
 		} rmdir_cbk;
 
 		/* symlink */
@@ -239,6 +251,8 @@ typedef struct {
 			int32_t op_ret, op_errno;
 			inode_t *inode;
 			struct stat buf;
+                        struct stat preparent;
+                        struct stat postparent;
 		} symlink_cbk;
 
 		/* rename */
@@ -251,6 +265,10 @@ typedef struct {
 			fop_rename_cbk_t fn;
 			int32_t op_ret, op_errno;
 			struct stat buf;
+                        struct stat preoldparent;
+                        struct stat postoldparent;
+                        struct stat prenewparent;
+                        struct stat postnewparent;
 		} rename_cbk;
 
 		/* link */
@@ -264,6 +282,8 @@ typedef struct {
 			int32_t op_ret, op_errno;
 			inode_t *inode;
 			struct stat buf;
+                        struct stat preparent;
+                        struct stat postparent;
 		} link_cbk;
 
 		/* create */
@@ -280,6 +300,8 @@ typedef struct {
 			fd_t *fd;
 			inode_t *inode;
 			struct stat buf;
+                        struct stat preparent;
+                        struct stat postparent;
 		} create_cbk;
 
 		/* open */
@@ -288,6 +310,7 @@ typedef struct {
 			loc_t loc;
 			int32_t flags;
 			fd_t *fd;
+                        int32_t wbflags;
 		} open;
 		struct {
 			fop_open_cbk_t fn;
@@ -324,7 +347,8 @@ typedef struct {
 		struct {
 			fop_writev_cbk_t fn;
 			int32_t op_ret, op_errno;
-			struct stat stbuf;
+                        struct stat prebuf;
+			struct stat postbuf;
 		} writev_cbk;
 
 		/* flush */
@@ -346,6 +370,8 @@ typedef struct {
 		struct {
 			fop_fsync_cbk_t fn;
 			int32_t op_ret, op_errno;
+                        struct stat prebuf;
+                        struct stat postbuf;
 		} fsync_cbk;
 
 		/* opendir */
@@ -678,7 +704,8 @@ fop_lookup_cbk_stub (call_frame_t *frame,
 		     int32_t op_errno,
 		     inode_t *inode,
 		     struct stat *buf,
-		     dict_t *dict);
+                     dict_t *dict,
+                     struct stat *postparent);
 call_stub_t *
 fop_stat_stub (call_frame_t *frame,
 	       fop_stat_t fn,
@@ -760,7 +787,8 @@ fop_truncate_cbk_stub (call_frame_t *frame,
 		       fop_truncate_cbk_t fn,
 		       int32_t op_ret,
 		       int32_t op_errno,
-		       struct stat *buf);
+		       struct stat *prebuf,
+                       struct stat *postbuf);
 
 call_stub_t *
 fop_ftruncate_stub (call_frame_t *frame,
@@ -773,7 +801,8 @@ fop_ftruncate_cbk_stub (call_frame_t *frame,
 			fop_ftruncate_cbk_t fn,
 			int32_t op_ret,
 			int32_t op_errno,
-			struct stat *buf);
+			struct stat *prebuf,
+                        struct stat *postbuf);
 
 call_stub_t *
 fop_utimens_stub (call_frame_t *frame,
@@ -811,7 +840,8 @@ fop_readlink_cbk_stub (call_frame_t *frame,
 		       fop_readlink_cbk_t fn,
 		       int32_t op_ret,
 		       int32_t op_errno,
-		       const char *path);
+		       const char *path,
+                       struct stat *buf);
 
 call_stub_t *
 fop_mknod_stub (call_frame_t *frame,
@@ -826,7 +856,9 @@ fop_mknod_cbk_stub (call_frame_t *frame,
 		    int32_t op_ret,
 		    int32_t op_errno,
 		    inode_t *inode,
-		    struct stat *buf);
+                    struct stat *buf,
+                    struct stat *preparent,
+                    struct stat *postparent);
 
 call_stub_t *
 fop_mkdir_stub (call_frame_t *frame,
@@ -840,7 +872,9 @@ fop_mkdir_cbk_stub (call_frame_t *frame,
 		    int32_t op_ret,
 		    int32_t op_errno,
 		    inode_t *inode,
-		    struct stat *buf);
+                    struct stat *buf,
+                    struct stat *preparent,
+                    struct stat *postparent);
 
 call_stub_t *
 fop_unlink_stub (call_frame_t *frame,
@@ -851,7 +885,9 @@ call_stub_t *
 fop_unlink_cbk_stub (call_frame_t *frame,
 		     fop_unlink_cbk_t fn,
 		     int32_t op_ret,
-		     int32_t op_errno);
+		     int32_t op_errno,
+                     struct stat *preparent,
+                     struct stat *postparent);
 
 call_stub_t *
 fop_rmdir_stub (call_frame_t *frame,
@@ -862,7 +898,9 @@ call_stub_t *
 fop_rmdir_cbk_stub (call_frame_t *frame,
 		    fop_rmdir_cbk_t fn,
 		    int32_t op_ret,
-		    int32_t op_errno);
+		    int32_t op_errno,
+                    struct stat *preparent,
+                    struct stat *postparent);
 
 call_stub_t *
 fop_symlink_stub (call_frame_t *frame,
@@ -876,7 +914,9 @@ fop_symlink_cbk_stub (call_frame_t *frame,
 		      int32_t op_ret,
 		      int32_t op_errno,
 		      inode_t *inode,
-		      struct stat *buf);
+                      struct stat *buf,
+                      struct stat *preparent,
+                      struct stat *postparent);
 
 call_stub_t *
 fop_rename_stub (call_frame_t *frame,
@@ -889,7 +929,11 @@ fop_rename_cbk_stub (call_frame_t *frame,
 		     fop_rename_cbk_t fn,
 		     int32_t op_ret,
 		     int32_t op_errno,
-		     struct stat *buf);
+		     struct stat *buf,
+                     struct stat *preoldparent,
+                     struct stat *postoldparent,
+                     struct stat *prenewparent,
+                     struct stat *postnewparent);
 
 call_stub_t *
 fop_link_stub (call_frame_t *frame,
@@ -903,7 +947,9 @@ fop_link_cbk_stub (call_frame_t *frame,
 		   int32_t op_ret,
 		   int32_t op_errno,
 		   inode_t *inode,
-		   struct stat *buf);
+                   struct stat *buf,
+                   struct stat *preparent,
+                   struct stat *postparent);
 
 call_stub_t *
 fop_create_stub (call_frame_t *frame,
@@ -919,14 +965,17 @@ fop_create_cbk_stub (call_frame_t *frame,
 		     int32_t op_errno,
 		     fd_t *fd,
 		     inode_t *inode,
-		     struct stat *buf);
+		     struct stat *buf,
+                     struct stat *preparent,
+                     struct stat *postparent);
 
 call_stub_t *
 fop_open_stub (call_frame_t *frame,
 	       fop_open_t fn,
 	       loc_t *loc,
 	       int32_t flags,
-	       fd_t *fd);
+	       fd_t *fd,
+               int32_t wbflags);
 
 call_stub_t *
 fop_open_cbk_stub (call_frame_t *frame,
@@ -966,7 +1015,8 @@ fop_writev_cbk_stub (call_frame_t *frame,
 		     fop_writev_cbk_t fn,
 		     int32_t op_ret,
 		     int32_t op_errno,
-		     struct stat *stbuf);
+                     struct stat *prebuf,
+                     struct stat *postbuf);
 
 call_stub_t *
 fop_flush_stub (call_frame_t *frame,
@@ -989,7 +1039,9 @@ call_stub_t *
 fop_fsync_cbk_stub (call_frame_t *frame,
 		    fop_fsync_cbk_t fn,
 		    int32_t op_ret,
-		    int32_t op_errno);
+		    int32_t op_errno,
+                    struct stat *prebuf,
+                    struct stat *postbuf);
 
 call_stub_t *
 fop_opendir_stub (call_frame_t *frame,
diff --git a/libglusterfs/src/defaults.c b/libglusterfs/src/defaults.c
index f72eca1f8..a21630103 100644
--- a/libglusterfs/src/defaults.c
+++ b/libglusterfs/src/defaults.c
@@ -41,14 +41,16 @@ default_lookup_cbk (call_frame_t *frame,
 		    int32_t op_errno,
 		    inode_t *inode,
 		    struct stat *buf,
-		    dict_t *dict)
+                    dict_t *dict,
+                    struct stat *postparent)
 {
 	STACK_UNWIND (frame,
 		      op_ret,
 		      op_errno,
 		      inode,
 		      buf,
-		      dict);
+                      dict,
+                      postparent);
 	return 0;
 }
 
@@ -234,12 +236,14 @@ default_truncate_cbk (call_frame_t *frame,
 		      xlator_t *this,
 		      int32_t op_ret,
 		      int32_t op_errno,
-		      struct stat *buf)
+		      struct stat *prebuf,
+                      struct stat *postbuf)
 {
 	STACK_UNWIND (frame,
 		      op_ret,
 		      op_errno,
-		      buf);
+		      prebuf,
+                      postbuf);
 	return 0;
 }
 
@@ -264,12 +268,14 @@ default_ftruncate_cbk (call_frame_t *frame,
 		       xlator_t *this,
 		       int32_t op_ret,
 		       int32_t op_errno,
-		       struct stat *buf)
+		       struct stat *prebuf,
+                       struct stat *postbuf)
 {
 	STACK_UNWIND (frame,
 		      op_ret,
 		      op_errno,
-		      buf);
+		      prebuf,
+                      postbuf);
 	return 0;
 }
 
@@ -354,12 +360,14 @@ default_readlink_cbk (call_frame_t *frame,
 		      xlator_t *this,
 		      int32_t op_ret,
 		      int32_t op_errno,
-		      const char *path)
+		      const char *path,
+                      struct stat *buf)
 {
 	STACK_UNWIND (frame,
 		      op_ret,
 		      op_errno,
-		      path);
+		      path,
+                      buf);
 	return 0;
 }
 
@@ -386,13 +394,17 @@ default_mknod_cbk (call_frame_t *frame,
 		   int32_t op_ret,
 		   int32_t op_errno,
 		   inode_t *inode,
-		   struct stat *buf)
+                   struct stat *buf,
+                   struct stat *preparent,
+                   struct stat *postparent)
 {
 	STACK_UNWIND (frame,
 		      op_ret,
 		      op_errno,
 		      inode,
-		      buf);
+                      buf,
+                      preparent,
+                      postparent);
 	return 0;
 }
 
@@ -418,13 +430,17 @@ default_mkdir_cbk (call_frame_t *frame,
 		   int32_t op_ret,
 		   int32_t op_errno,
 		   inode_t *inode,
-		   struct stat *buf)
+                   struct stat *buf,
+                   struct stat *preparent,
+                   struct stat *postparent)
 {
 	STACK_UNWIND (frame,
 		      op_ret,
 		      op_errno,
 		      inode,
-		      buf);
+                      buf,
+                      preparent,
+                      postparent);
 	return 0;
 }
 
@@ -447,9 +463,11 @@ default_unlink_cbk (call_frame_t *frame,
 		    void *cookie,
 		    xlator_t *this,
 		    int32_t op_ret,
-		    int32_t op_errno)
+		    int32_t op_errno,
+                    struct stat *preparent,
+                    struct stat *postparent)
 {
-	STACK_UNWIND (frame, op_ret, op_errno);
+	STACK_UNWIND (frame, op_ret, op_errno, preparent, postparent);
 	return 0;
 }
 
@@ -471,11 +489,15 @@ default_rmdir_cbk (call_frame_t *frame,
 		   void *cookie,
 		   xlator_t *this,
 		   int32_t op_ret,
-		   int32_t op_errno)
+		   int32_t op_errno,
+                   struct stat *preparent,
+                   struct stat *postparent)
 {
 	STACK_UNWIND (frame,
 		      op_ret,
-		      op_errno);
+		      op_errno,
+                      preparent,
+                      postparent);
 	return 0;
 }
 
@@ -500,9 +522,12 @@ default_symlink_cbk (call_frame_t *frame,
 		     int32_t op_ret,
 		     int32_t op_errno,
 		     inode_t *inode,
-		     struct stat *buf)
+                     struct stat *buf,
+                     struct stat *preparent,
+                     struct stat *postparent)
 {
-	STACK_UNWIND (frame, op_ret, op_errno, inode,	buf);
+        STACK_UNWIND (frame, op_ret, op_errno, inode, buf, preparent,
+                      postparent);
 	return 0;
 }
 
@@ -527,9 +552,14 @@ default_rename_cbk (call_frame_t *frame,
 		    xlator_t *this,
 		    int32_t op_ret,
 		    int32_t op_errno,
-		    struct stat *buf)
+		    struct stat *buf,
+                    struct stat *preoldparent,
+                    struct stat *postoldparent,
+                    struct stat *prenewparent,
+                    struct stat *postnewparent)
 {
-	STACK_UNWIND (frame, op_ret, op_errno, buf);
+	STACK_UNWIND (frame, op_ret, op_errno, buf, preoldparent, postoldparent,
+                      prenewparent, postnewparent);
 	return 0;
 }
 
@@ -555,9 +585,12 @@ default_link_cbk (call_frame_t *frame,
 		  int32_t op_ret,
 		  int32_t op_errno,
 		  inode_t *inode,
-		  struct stat *buf)
+                  struct stat *buf,
+                  struct stat *preparent,
+                  struct stat *postparent)
 {
-	STACK_UNWIND (frame, op_ret, op_errno, inode,	buf);
+        STACK_UNWIND (frame, op_ret, op_errno, inode, buf, preparent,
+                      postparent);
 	return 0;
 }
 
@@ -584,9 +617,12 @@ default_create_cbk (call_frame_t *frame,
 		    int32_t op_errno,
 		    fd_t *fd,
 		    inode_t *inode,
-		    struct stat *buf)
+		    struct stat *buf,
+                    struct stat *preparent,
+                    struct stat *postparent)
 {
-	STACK_UNWIND (frame, op_ret, op_errno, fd, inode, buf);
+	STACK_UNWIND (frame, op_ret, op_errno, fd, inode, buf, preparent,
+                      postparent);
 	return 0;
 }
 
@@ -623,13 +659,14 @@ int32_t
 default_open (call_frame_t *frame,
 	      xlator_t *this,
 	      loc_t *loc,
-	      int32_t flags, fd_t *fd)
+	      int32_t flags, fd_t *fd,
+              int32_t wbflags)
 {
 	STACK_WIND (frame,
 		    default_open_cbk,
 		    FIRST_CHILD(this),
 		    FIRST_CHILD(this)->fops->open,
-		    loc, flags, fd);
+		    loc, flags, fd, wbflags);
 	return 0;
 }
 
@@ -678,12 +715,14 @@ default_writev_cbk (call_frame_t *frame,
 		    xlator_t *this,
 		    int32_t op_ret,
 		    int32_t op_errno,
-		    struct stat *stbuf)
+                    struct stat *prebuf,
+		    struct stat *postbuf)
 {
 	STACK_UNWIND (frame,
 		      op_ret,
 		      op_errno,
-		      stbuf);
+                      prebuf,
+		      postbuf);
 	return 0;
 }
 
@@ -740,11 +779,15 @@ default_fsync_cbk (call_frame_t *frame,
 		   void *cookie,
 		   xlator_t *this,
 		   int32_t op_ret,
-		   int32_t op_errno)
+		   int32_t op_errno,
+                   struct stat *prebuf,
+                   struct stat *postbuf)
 {
 	STACK_UNWIND (frame,
 		      op_ret,
-		      op_errno);
+		      op_errno,
+                      prebuf,
+                      postbuf);
 	return 0;
 }
 
diff --git a/libglusterfs/src/defaults.h b/libglusterfs/src/defaults.h
index d8b998486..2c167d97e 100644
--- a/libglusterfs/src/defaults.h
+++ b/libglusterfs/src/defaults.h
@@ -161,7 +161,8 @@ int32_t default_create (call_frame_t *frame,
 int32_t default_open (call_frame_t *frame,
 		      xlator_t *this,
 		      loc_t *loc,
-		      int32_t flags, fd_t *fd);
+		      int32_t flags, fd_t *fd,
+                      int32_t wbflags);
 
 int32_t default_readv (call_frame_t *frame,
 		       xlator_t *this,
diff --git a/libglusterfs/src/protocol.h b/libglusterfs/src/protocol.h
index 91b876a6f..59ebaf2bc 100644
--- a/libglusterfs/src/protocol.h
+++ b/libglusterfs/src/protocol.h
@@ -337,6 +337,7 @@ typedef struct {
 	char     path[0];     /* NULL terminated */
 } __attribute__((packed)) gf_fop_readlink_req_t;
 typedef struct {
+        struct gf_stat buf;
 	char     path[0]; /* NULL terminated */
 } __attribute__((packed)) gf_fop_readlink_rsp_t;
 
@@ -350,6 +351,8 @@ typedef struct {
 } __attribute__((packed)) gf_fop_mknod_req_t;
 typedef struct {
 	struct gf_stat stat;
+        struct gf_stat preparent;
+        struct gf_stat postparent;
 } __attribute__((packed)) gf_fop_mknod_rsp_t;
 
 
@@ -361,6 +364,8 @@ typedef struct {
 } __attribute__((packed)) gf_fop_mkdir_req_t;
 typedef struct {
 	struct gf_stat stat;
+        struct gf_stat preparent;
+        struct gf_stat postparent;
 } __attribute__((packed)) gf_fop_mkdir_rsp_t;
 
 
@@ -370,6 +375,8 @@ typedef struct {
 	char     bname[0]; /* NULL terminated */
 } __attribute__((packed)) gf_fop_unlink_req_t;
 typedef struct {
+        struct gf_stat preparent;
+        struct gf_stat postparent;
 } __attribute__((packed)) gf_fop_unlink_rsp_t;
 
 
@@ -379,6 +386,8 @@ typedef struct {
 	char     bname[0]; /* NULL terminated */
 } __attribute__((packed)) gf_fop_rmdir_req_t;
 typedef struct {
+        struct gf_stat preparent;
+        struct gf_stat postparent;
 } __attribute__((packed)) gf_fop_rmdir_rsp_t;
 
 
@@ -390,6 +399,8 @@ typedef struct {
 } __attribute__((packed)) gf_fop_symlink_req_t;
 typedef struct {
 	struct gf_stat stat;
+        struct gf_stat preparent;
+        struct gf_stat postparent;
 }__attribute__((packed)) gf_fop_symlink_rsp_t;
 
 
@@ -403,6 +414,10 @@ typedef struct {
 } __attribute__((packed)) gf_fop_rename_req_t;
 typedef struct {
 	struct gf_stat stat;
+        struct gf_stat preoldparent;
+        struct gf_stat postoldparent;
+        struct gf_stat prenewparent;
+        struct gf_stat postnewparent;
 } __attribute__((packed)) gf_fop_rename_rsp_t;
 
 
@@ -415,6 +430,8 @@ typedef struct {
 }__attribute__((packed)) gf_fop_link_req_t;
 typedef struct {
 	struct gf_stat stat;
+        struct gf_stat preparent;
+        struct gf_stat postparent;
 } __attribute__((packed)) gf_fop_link_rsp_t;
 
 
@@ -445,13 +462,15 @@ typedef struct {
 	char     path[0];
 } __attribute__((packed)) gf_fop_truncate_req_t;
 typedef struct {
-	struct gf_stat stat;
+	struct gf_stat prestat;
+        struct gf_stat poststat;
 } __attribute__((packed)) gf_fop_truncate_rsp_t;
 
 
 typedef struct {
 	uint64_t ino;
 	uint32_t flags;
+        uint32_t wbflags;
 	char     path[0];
 } __attribute__((packed)) gf_fop_open_req_t;
 typedef struct {
@@ -478,7 +497,8 @@ typedef struct {
 	uint32_t size;
 } __attribute__((packed)) gf_fop_write_req_t;
 typedef struct {
-	struct gf_stat stat;
+	struct gf_stat prestat;
+        struct gf_stat poststat;
 } __attribute__((packed)) gf_fop_write_rsp_t;
 
 
@@ -504,6 +524,8 @@ typedef struct fsync_req {
 	uint32_t data;
 } __attribute__((packed)) gf_fop_fsync_req_t;
 typedef struct {
+        struct gf_stat prestat;
+        struct gf_stat poststat;
 } __attribute__((packed)) gf_fop_fsync_rsp_t;
 
 
@@ -636,6 +658,8 @@ typedef struct {
 typedef struct {
 	struct gf_stat stat;
 	uint64_t       fd;
+        struct gf_stat preparent;
+        struct gf_stat postparent;
 } __attribute__((packed)) gf_fop_create_rsp_t;
 
 
@@ -646,7 +670,8 @@ typedef struct {
 	uint64_t offset;
 } __attribute__((packed)) gf_fop_ftruncate_req_t;
 typedef struct {
-	struct gf_stat stat;
+	struct gf_stat prestat;
+        struct gf_stat poststat;
 } __attribute__((packed)) gf_fop_ftruncate_rsp_t;
 
 
@@ -757,6 +782,7 @@ typedef struct {
 } __attribute__((packed)) gf_fop_lookup_req_t;
 typedef struct {
 	struct gf_stat stat;
+        struct gf_stat postparent;
 	uint32_t       dict_len;
 	char           dict[0];
 } __attribute__((packed)) gf_fop_lookup_rsp_t;
diff --git a/libglusterfs/src/xlator.h b/libglusterfs/src/xlator.h
index afaaed4a4..a00d4975d 100644
--- a/libglusterfs/src/xlator.h
+++ b/libglusterfs/src/xlator.h
@@ -172,7 +172,8 @@ typedef int32_t (*fop_lookup_cbk_t) (call_frame_t *frame,
 				     int32_t op_errno,
 				     inode_t *inode,
 				     struct stat *buf,
-				     dict_t *xattr);
+                                     dict_t *xattr,
+                                     struct stat *postparent);
 
 typedef int32_t (*fop_stat_cbk_t) (call_frame_t *frame,
 				   void *cookie,
@@ -221,14 +222,16 @@ typedef int32_t (*fop_truncate_cbk_t) (call_frame_t *frame,
 				       xlator_t *this,
 				       int32_t op_ret,
 				       int32_t op_errno,
-				       struct stat *buf);
+				       struct stat *prebuf,
+                                       struct stat *postbuf);
 
 typedef int32_t (*fop_ftruncate_cbk_t) (call_frame_t *frame,
 					void *cookie,
 					xlator_t *this,
 					int32_t op_ret,
 					int32_t op_errno,
-					struct stat *buf);
+					struct stat *prebuf,
+                                        struct stat *postbuf);
 
 typedef int32_t (*fop_utimens_cbk_t) (call_frame_t *frame,
 				      void *cookie,
@@ -248,7 +251,8 @@ typedef int32_t (*fop_readlink_cbk_t) (call_frame_t *frame,
 				       xlator_t *this,
 				       int32_t op_ret,
 				       int32_t op_errno,
-				       const char *path);
+				       const char *path,
+                                       struct stat *buf);
 
 typedef int32_t (*fop_mknod_cbk_t) (call_frame_t *frame,
 				    void *cookie,
@@ -256,7 +260,9 @@ typedef int32_t (*fop_mknod_cbk_t) (call_frame_t *frame,
 				    int32_t op_ret,
 				    int32_t op_errno,
 				    inode_t *inode,
-				    struct stat *buf);
+                                    struct stat *buf,
+                                    struct stat *preparent,
+                                    struct stat *postparent);
 
 typedef int32_t (*fop_mkdir_cbk_t) (call_frame_t *frame,
 				    void *cookie,
@@ -264,19 +270,25 @@ typedef int32_t (*fop_mkdir_cbk_t) (call_frame_t *frame,
 				    int32_t op_ret,
 				    int32_t op_errno,
 				    inode_t *inode,
-				    struct stat *buf);
+                                    struct stat *buf,
+                                    struct stat *preparent,
+                                    struct stat *postparent);
 
 typedef int32_t (*fop_unlink_cbk_t) (call_frame_t *frame,
 				     void *cookie,
 				     xlator_t *this,
 				     int32_t op_ret,
-				     int32_t op_errno);
+				     int32_t op_errno,
+                                     struct stat *preparent,
+                                     struct stat *postparent);
 
 typedef int32_t (*fop_rmdir_cbk_t) (call_frame_t *frame,
 				    void *cookie,
 				    xlator_t *this,
 				    int32_t op_ret,
-				    int32_t op_errno);
+				    int32_t op_errno,
+                                    struct stat *preparent,
+                                    struct stat *postparent);
 
 typedef int32_t (*fop_symlink_cbk_t) (call_frame_t *frame,
 				      void *cookie,
@@ -284,14 +296,20 @@ typedef int32_t (*fop_symlink_cbk_t) (call_frame_t *frame,
 				      int32_t op_ret,
 				      int32_t op_errno,
 				      inode_t *inode,
-				      struct stat *buf);
+                                      struct stat *buf,
+                                      struct stat *preparent,
+                                      struct stat *postparent);
 
 typedef int32_t (*fop_rename_cbk_t) (call_frame_t *frame,
 				     void *cookie,
 				     xlator_t *this,
 				     int32_t op_ret,
 				     int32_t op_errno,
-				     struct stat *buf);
+				     struct stat *buf,
+                                     struct stat *preoldparent,
+                                     struct stat *postoldparent,
+                                     struct stat *prenewparent,
+                                     struct stat *postnewparent);
 
 typedef int32_t (*fop_link_cbk_t) (call_frame_t *frame,
 				   void *cookie,
@@ -299,7 +317,9 @@ typedef int32_t (*fop_link_cbk_t) (call_frame_t *frame,
 				   int32_t op_ret,
 				   int32_t op_errno,
 				   inode_t *inode,
-				   struct stat *buf);
+                                   struct stat *buf,
+                                   struct stat *preparent,
+                                   struct stat *postparent);
 
 typedef int32_t (*fop_create_cbk_t) (call_frame_t *frame,
 				     void *cookie,
@@ -308,7 +328,9 @@ typedef int32_t (*fop_create_cbk_t) (call_frame_t *frame,
 				     int32_t op_errno,
 				     fd_t *fd,
 				     inode_t *inode,
-				     struct stat *buf);
+				     struct stat *buf,
+                                     struct stat *preparent,
+                                     struct stat *postparent);
 
 typedef int32_t (*fop_open_cbk_t) (call_frame_t *frame,
 				   void *cookie,
@@ -332,7 +354,8 @@ typedef int32_t (*fop_writev_cbk_t) (call_frame_t *frame,
 				     xlator_t *this,
 				     int32_t op_ret,
 				     int32_t op_errno,
-				     struct stat *stbuf);
+				     struct stat *prebuf,
+                                     struct stat *postbuf);
 
 typedef int32_t (*fop_flush_cbk_t) (call_frame_t *frame,
 				    void *cookie,
@@ -344,7 +367,9 @@ typedef int32_t (*fop_fsync_cbk_t) (call_frame_t *frame,
 				    void *cookie,
 				    xlator_t *this,
 				    int32_t op_ret,
-				    int32_t op_errno);
+				    int32_t op_errno,
+                                    struct stat *prebuf,
+                                    struct stat *postbuf);
 
 typedef int32_t (*fop_opendir_cbk_t) (call_frame_t *frame,
 				      void *cookie,
@@ -593,11 +618,21 @@ typedef int32_t (*fop_create_t) (call_frame_t *frame,
 				 mode_t mode,
 				 fd_t *fd);
 
+/* Tell subsequent writes on the fd_t to fsync after every writev fop without
+ * requiring a fsync fop.
+ */
+#define GF_OPEN_FSYNC   0x01
+
+/* Tell write-behind to disable writing behind despite O_SYNC not being set.
+ */
+#define GF_OPEN_NOWB    0x02
+
 typedef int32_t (*fop_open_t) (call_frame_t *frame,
 			       xlator_t *this,
 			       loc_t *loc,
 			       int32_t flags,
-			       fd_t *fd);
+			       fd_t *fd,
+                               int32_t wbflags);
 
 typedef int32_t (*fop_readv_t) (call_frame_t *frame,
 				xlator_t *this,