Added all files

4 files changed, 2641 insertions, 0 deletions

diff --git a/xlators/cluster/map/src/Makefile.am b/xlators/cluster/map/src/Makefile.am
new file mode 100644
index 00000000000..44ee4d9eed3
--- /dev/null
+++ b/xlators/cluster/map/src/Makefile.am
@@ -0,0 +1,15 @@
+xlator_LTLIBRARIES = map.la
+xlatordir = $(libdir)/glusterfs/$(PACKAGE_VERSION)/xlator/cluster
+
+map_la_LDFLAGS = -module -avoidversion 
+
+map_la_SOURCES = map.c map-helper.c
+map_la_LIBADD = $(top_builddir)/libglusterfs/src/libglusterfs.la
+
+noinst_HEADERS = map.h
+
+AM_CFLAGS = -fPIC -D_FILE_OFFSET_BITS=64 -D_GNU_SOURCE -Wall -D$(GF_HOST_OS) \
+	    -I$(top_srcdir)/libglusterfs/src -shared -nostartfiles $(GF_CFLAGS)
+
+CLEANFILES = 
+
diff --git a/xlators/cluster/map/src/map-helper.c b/xlators/cluster/map/src/map-helper.c
new file mode 100644
index 00000000000..4e51219d491
--- /dev/null
+++ b/xlators/cluster/map/src/map-helper.c
@@ -0,0 +1,357 @@
+/*
+  Copyright (c) 2009 Z RESEARCH, Inc. <http://www.zresearch.com>
+  This file is part of GlusterFS.
+
+  GlusterFS is free software; you can redistribute it and/or modify
+  it under the terms of the GNU General Public License as published
+  by the Free Software Foundation; either version 3 of the License,
+  or (at your option) any later version.
+
+  GlusterFS is distributed in the hope that it will be useful, but
+  WITHOUT ANY WARRANTY; without even the implied warranty of
+  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+  General Public License for more details.
+
+  You should have received a copy of the GNU General Public License
+  along with this program.  If not, see
+  <http://www.gnu.org/licenses/>.
+*/
+
+#ifndef _CONFIG_H
+#define _CONFIG_H
+#include "config.h"
+#endif
+
+#include "xlator.h"
+#include "map.h"
+
+
+xlator_t *
+map_subvol_next (xlator_t *this, xlator_t *prev)
+{
+	map_private_t *priv = NULL;
+	xlator_t      *next = NULL;
+	int            i = 0;
+
+	priv = this->private;
+
+	for (i = 0; i < priv->child_count; i++) {
+		if (priv->xlarray[i].xl == prev) {
+			if ((i + 1) < priv->child_count)
+				next = priv->xlarray[i + 1].xl;
+			break;
+		}
+	}
+
+	return next;
+}
+
+int
+map_subvol_cnt (xlator_t *this, xlator_t *subvol)
+{
+	int i = 0;
+	int ret = -1;
+	map_private_t *priv = NULL;
+
+	priv = this->private;
+
+	for (i = 0; i < priv->child_count; i++) {
+		if (subvol == priv->xlarray[i].xl) {
+			ret = i;
+			break;
+		}
+	}
+
+	return ret;
+}
+
+int
+map_itransform (xlator_t *this, xlator_t *subvol, uint64_t x, uint64_t *y_p)
+{
+	map_private_t *priv = NULL;
+	int         cnt = 0;
+	int         max = 0;
+	uint64_t    y = 0;
+
+	if (x == ((uint64_t) -1)) {
+		y = (uint64_t) -1;
+		goto out;
+	}
+
+	priv = this->private;
+
+	max = priv->child_count;
+	cnt = map_subvol_cnt (this, subvol);
+
+	y = ((x * max) + cnt);
+
+out:
+	if (y_p)
+		*y_p = y;
+
+	return 0;
+}
+
+
+int
+map_deitransform (xlator_t *this, uint64_t y, xlator_t **subvol_p,
+		  uint64_t *x_p)
+{
+	int         cnt = 0;
+	int         max = 0;
+	uint64_t    x = 0;
+	xlator_t   *subvol = 0;
+	map_private_t *priv = NULL;
+
+	priv = this->private;
+	max = priv->child_count;
+
+	cnt = y % max;
+	x   = y / max;
+
+	subvol = priv->xlarray[cnt].xl;
+
+	if (subvol_p)
+		*subvol_p = subvol;
+
+	if (x_p)
+		*x_p = x;
+
+	return 0;
+}
+
+
+xlator_t *
+get_mapping_subvol_from_path (xlator_t *this, const char *path) 
+{
+	map_private_t      *priv = NULL;
+	struct map_pattern *map = NULL;
+
+	/* To make sure we handle '/' properly */
+	if (!strcmp (path, "/"))
+		return NULL;
+
+	priv = this->private;
+
+	map = priv->map;
+	while (map) {
+		if (!strncmp (map->directory, path, map->dir_len)) {
+			if ((path[map->dir_len] == '/') ||
+			    (path[map->dir_len] == '\0')) {
+				return map->xl;
+			}
+		}
+		
+		map = map->next;
+	}
+
+	return priv->default_xl;
+}
+
+xlator_t *
+get_mapping_subvol_from_ctx (xlator_t *this, inode_t *inode)
+{
+	uint64_t subvol = 0;
+	int      ret    = -1;
+
+	ret = inode_ctx_get (inode, this, &subvol);
+	if (ret != 0) 
+		return NULL;
+
+	return (xlator_t *)(long)subvol;
+}
+
+int
+check_multiple_volume_entry (xlator_t *this, 
+			     xlator_t *subvol)
+{
+	int ret = -1;
+	int idx = 0;
+	map_private_t *priv = NULL;
+
+	priv = this->private;
+	
+	for (idx = 0; idx < priv->child_count; idx++) {
+		if (priv->xlarray[idx].xl == subvol) {
+			if (priv->xlarray[idx].mapped) {
+				gf_log (this->name, GF_LOG_ERROR,
+					"subvolume '%s' is already mapped",
+					subvol->name);
+				goto out;
+			}
+			priv->xlarray[idx].mapped = 1;
+			ret = 0;
+			goto out;
+		}
+	}
+
+	gf_log (this->name, GF_LOG_ERROR,
+		"subvolume '%s' is not found",
+		subvol->name);
+	
+ out:
+	return ret;
+}
+
+int
+verify_dir_and_assign_subvol (xlator_t *this, 
+			      const char *directory, 
+			      const char *subvol)
+{
+	int            default_flag = 0;
+	int            ret  = -1;
+	int            idx  = 0;
+	map_private_t *priv = NULL;
+	xlator_list_t *trav = NULL;
+	struct map_pattern *tmp_map = NULL;
+
+	priv = this->private;
+
+	/* check if directory is valid, ie, its a top level dir, and 
+	 * not includes a '*' in it.
+	 */
+	if (!strcmp ("*", directory)) {
+		default_flag = 1;
+	} else {
+		if (directory[0] != '/') {
+			gf_log (this->name, GF_LOG_ERROR,
+				"map takes absolute path, starting with '/'. "
+				"not '%s'", directory);
+			goto out;
+		}
+		for (idx = 1; idx < (strlen (directory) - 1); idx++) {
+			if (directory[idx] == '/') {
+				gf_log (this->name, GF_LOG_ERROR,
+					"map takes only top level directory, "
+					"not '%s'", directory);
+				goto out;
+			}
+		}
+	}
+
+	/* Assign proper subvolume */
+	trav = this->children;
+	while (trav) {
+		if (!strcmp (trav->xlator->name, subvol)) {
+			
+			/* Check if there is another directory for 
+			 * same volume, if yes, return error.
+			 */
+			ret = check_multiple_volume_entry (this, 
+							   trav->xlator);
+			if (ret != 0) {
+				goto out;
+			}
+
+			ret = 0;
+			if (default_flag) {
+				if (priv->default_xl) {
+					ret = -1;
+					gf_log (this->name, GF_LOG_ERROR,
+						"'*' specified more than "
+						"once. don't confuse me!!!");
+				}
+
+				priv->default_xl = trav->xlator;
+				goto out;
+			}
+
+			tmp_map = CALLOC (1, sizeof (struct map_pattern));
+			tmp_map->xl = trav->xlator;
+			tmp_map->dir_len = strlen (directory);
+
+			/* make sure that the top level directory starts 
+			 * with '/' and ends without '/'
+			 */
+			tmp_map->directory = strdup (directory);
+			if (directory[tmp_map->dir_len - 1] == '/') {
+				tmp_map->dir_len--;
+			}
+
+			if (!priv->map) 
+				priv->map = tmp_map;
+			else {
+				struct map_pattern *trav_map = NULL;
+				trav_map = priv->map;
+				while (trav_map->next)
+					trav_map = trav_map->next;
+				trav_map->next = tmp_map;
+			}
+			
+			goto out;
+		}
+
+		trav = trav->next;
+	}
+
+	gf_log (this->name, GF_LOG_ERROR, 
+		"map volume '%s' is not proper subvolume", subvol);
+
+ out:
+	return ret;
+}
+
+int 
+assign_default_subvol (xlator_t *this, const char *default_xl)
+{
+	int ret = -1;
+	map_private_t *priv = NULL;
+	xlator_list_t *trav = NULL;
+
+	priv = this->private;
+	trav = this->children;
+
+	while (trav) {
+		if (!strcmp (trav->xlator->name, default_xl)) {
+			ret = check_multiple_volume_entry (this, 
+							   trav->xlator);
+			if (ret != 0) {
+				goto out;
+			}
+			if (priv->default_xl)
+				gf_log (this->name, GF_LOG_WARNING,
+					"default-volume option provided, "
+					"overriding earlier '*' option");
+			priv->default_xl = trav->xlator;
+			return 0;
+		}
+		trav = trav->next;
+	}
+
+	gf_log (this->name, GF_LOG_ERROR,
+		"default-volume value is not an valid subvolume. check again");
+ out:
+	return -1;
+}
+
+void
+verify_if_all_subvolumes_got_used (xlator_t *this)
+{
+	int idx = 0;
+	map_private_t *priv = NULL;
+
+	priv = this->private;
+	
+	for (idx = 0; idx < priv->child_count; idx++) {
+		if (!priv->xlarray[idx].mapped) {
+			if (!priv->default_xl) {
+				priv->default_xl = priv->xlarray[idx].xl;
+				priv->xlarray[idx].mapped = 1;
+			} else {
+				gf_log (this->name, GF_LOG_WARNING,
+					"subvolume '%s' is not mapped to "
+					"any directory",
+					priv->xlarray[idx].xl->name);
+			}
+		}
+	}
+
+	if (!priv->default_xl) {
+		gf_log (this->name, GF_LOG_WARNING,
+			"default subvolume not specified, filesystem "
+			"may not work properly. Check 'map' translator "
+			"documentation for more info");
+	}
+
+	return ;
+}
diff --git a/xlators/cluster/map/src/map.c b/xlators/cluster/map/src/map.c
new file mode 100644
index 00000000000..8c4b7c83c50
--- /dev/null
+++ b/xlators/cluster/map/src/map.c
@@ -0,0 +1,2193 @@
+/*
+  Copyright (c) 2009 Z RESEARCH, Inc. <http://www.zresearch.com>
+  This file is part of GlusterFS.
+
+  GlusterFS is free software; you can redistribute it and/or modify
+  it under the terms of the GNU General Public License as published
+  by the Free Software Foundation; either version 3 of the License,
+  or (at your option) any later version.
+
+  GlusterFS is distributed in the hope that it will be useful, but
+  WITHOUT ANY WARRANTY; without even the implied warranty of
+  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+  General Public License for more details.
+
+  You should have received a copy of the GNU General Public License
+  along with this program.  If not, see
+  <http://www.gnu.org/licenses/>.
+*/
+
+#ifndef _CONFIG_H
+#define _CONFIG_H
+#include "config.h"
+#endif
+
+#include "xlator.h"
+#include "map.h"
+
+/* For <op>_cbk functions */
+#include "defaults.c"
+
+
+int32_t
+map_stat (call_frame_t *frame,
+	  xlator_t *this,
+	  loc_t *loc)
+{
+	int32_t op_errno = 1;
+	xlator_t *subvol   = NULL;
+
+        VALIDATE_OR_GOTO (frame, err);
+        VALIDATE_OR_GOTO (this, err);
+        VALIDATE_OR_GOTO (loc, err);
+        VALIDATE_OR_GOTO (loc->inode, err);
+        VALIDATE_OR_GOTO (loc->path, err);
+
+	subvol = get_mapping_subvol_from_ctx (this, loc->inode);
+	if (!subvol) {
+		op_errno = EINVAL;
+		goto err;
+	}
+
+	STACK_WIND (frame,
+		    default_stat_cbk,
+		    subvol,
+		    subvol->fops->stat,
+		    loc);
+
+	return 0;
+ err:
+	STACK_UNWIND (frame, -1, op_errno, NULL, NULL);
+
+	return 0;
+}
+
+
+int32_t
+map_chmod (call_frame_t *frame,
+	   xlator_t *this,
+	   loc_t *loc,
+	   mode_t mode)
+{
+	int32_t op_errno = 1;
+	xlator_t *subvol   = NULL;
+
+        VALIDATE_OR_GOTO (frame, err);
+        VALIDATE_OR_GOTO (this, err);
+        VALIDATE_OR_GOTO (loc, err);
+        VALIDATE_OR_GOTO (loc->inode, err);
+        VALIDATE_OR_GOTO (loc->path, err);
+
+	subvol = get_mapping_subvol_from_ctx (this, loc->inode);
+	if (!subvol) {
+		op_errno = EINVAL;
+		goto err;
+	}
+
+	STACK_WIND (frame,
+		    default_chmod_cbk,
+		    subvol,
+		    subvol->fops->chmod,
+		    loc,
+		    mode);
+	return 0;
+ err:
+	STACK_UNWIND (frame, -1, op_errno, NULL, NULL);
+
+	return 0;
+}
+
+int32_t
+map_fchmod (call_frame_t *frame,
+	    xlator_t *this,
+	    fd_t *fd,
+	    mode_t mode)
+{
+	int32_t op_errno = 1;
+	xlator_t *subvol   = NULL;
+
+        VALIDATE_OR_GOTO (frame, err);
+        VALIDATE_OR_GOTO (this, err);
+        VALIDATE_OR_GOTO (fd, err);
+        VALIDATE_OR_GOTO (fd->inode, err);
+
+	subvol = get_mapping_subvol_from_ctx (this, fd->inode);
+	if (!subvol) {
+		op_errno = EINVAL;
+		goto err;
+	}
+
+	STACK_WIND (frame,
+		    default_fchmod_cbk,
+		    subvol,
+		    subvol->fops->fchmod,
+		    fd,
+		    mode);
+	return 0;
+ err:
+	STACK_UNWIND (frame, -1, op_errno, NULL, NULL);
+
+	return 0;
+}
+
+int32_t
+map_chown (call_frame_t *frame,
+	   xlator_t *this,
+	   loc_t *loc,
+	   uid_t uid,
+	   gid_t gid)
+{
+	int32_t op_errno = 1;
+	xlator_t *subvol   = NULL;
+
+        VALIDATE_OR_GOTO (frame, err);
+        VALIDATE_OR_GOTO (this, err);
+        VALIDATE_OR_GOTO (loc, err);
+        VALIDATE_OR_GOTO (loc->inode, err);
+        VALIDATE_OR_GOTO (loc->path, err);
+
+	subvol = get_mapping_subvol_from_ctx (this, loc->inode);
+	if (!subvol) {
+		op_errno = EINVAL;
+		goto err;
+	}
+
+	STACK_WIND (frame,
+		    default_chown_cbk,
+		    subvol,
+		    subvol->fops->chown,
+		    loc,
+		    uid,
+		    gid);
+	return 0;
+ err:
+	STACK_UNWIND (frame, -1, op_errno, NULL, NULL);
+
+	return 0;
+}
+
+int32_t
+map_fchown (call_frame_t *frame,
+	    xlator_t *this,
+	    fd_t *fd,
+	    uid_t uid,
+	    gid_t gid)
+{
+	int32_t op_errno = 1;
+	xlator_t *subvol   = NULL;
+
+        VALIDATE_OR_GOTO (frame, err);
+        VALIDATE_OR_GOTO (this, err);
+        VALIDATE_OR_GOTO (fd, err);
+        VALIDATE_OR_GOTO (fd->inode, err);
+
+	subvol = get_mapping_subvol_from_ctx (this, fd->inode);
+	if (!subvol) {
+		op_errno = EINVAL;
+		goto err;
+	}
+
+	STACK_WIND (frame,
+		    default_fchown_cbk,
+		    subvol,
+		    subvol->fops->fchown,
+		    fd,
+		    uid,
+		    gid);
+	return 0;
+ err:
+	STACK_UNWIND (frame, -1, op_errno, NULL, NULL);
+
+	return 0;
+}
+
+int32_t
+map_truncate (call_frame_t *frame,
+	      xlator_t *this,
+	      loc_t *loc,
+	      off_t offset)
+{
+	int32_t op_errno = 1;
+	xlator_t *subvol   = NULL;
+
+        VALIDATE_OR_GOTO (frame, err);
+        VALIDATE_OR_GOTO (this, err);
+        VALIDATE_OR_GOTO (loc, err);
+        VALIDATE_OR_GOTO (loc->inode, err);
+        VALIDATE_OR_GOTO (loc->path, err);
+
+	subvol = get_mapping_subvol_from_ctx (this, loc->inode);
+	if (!subvol) {
+		op_errno = EINVAL;
+		goto err;
+	}
+
+	STACK_WIND (frame,
+		    default_truncate_cbk,
+		    subvol,
+		    subvol->fops->truncate,
+		    loc,
+		    offset);
+	return 0;
+ err:
+	STACK_UNWIND (frame, -1, op_errno, NULL, NULL);
+
+	return 0;
+}
+
+int32_t
+map_ftruncate (call_frame_t *frame,
+	       xlator_t *this,
+	       fd_t *fd,
+	       off_t offset)
+{
+	int32_t op_errno = 1;
+	xlator_t *subvol   = NULL;
+
+        VALIDATE_OR_GOTO (frame, err);
+        VALIDATE_OR_GOTO (this, err);
+        VALIDATE_OR_GOTO (fd, err);
+        VALIDATE_OR_GOTO (fd->inode, err);
+
+	subvol = get_mapping_subvol_from_ctx (this, fd->inode);
+	if (!subvol) {
+		op_errno = EINVAL;
+		goto err;
+	}
+
+	STACK_WIND (frame,
+		    default_ftruncate_cbk,
+		    subvol,
+		    subvol->fops->ftruncate,
+		    fd,
+		    offset);
+	return 0;
+ err:
+	STACK_UNWIND (frame, -1, op_errno, NULL, NULL);
+
+	return 0;
+}
+
+int32_t
+map_utimens (call_frame_t *frame,
+	     xlator_t *this,
+	     loc_t *loc,
+	     struct timespec tv[2])
+{
+	int32_t op_errno = 1;
+	xlator_t *subvol   = NULL;
+
+        VALIDATE_OR_GOTO (frame, err);
+        VALIDATE_OR_GOTO (this, err);
+        VALIDATE_OR_GOTO (loc, err);
+        VALIDATE_OR_GOTO (loc->inode, err);
+        VALIDATE_OR_GOTO (loc->path, err);
+
+	subvol = get_mapping_subvol_from_ctx (this, loc->inode);
+	if (!subvol) {
+		op_errno = EINVAL;
+		goto err;
+	}
+
+	STACK_WIND (frame,
+		    default_utimens_cbk,
+		    subvol,
+		    subvol->fops->utimens,
+		    loc,
+		    tv);
+	return 0;
+ err:
+	STACK_UNWIND (frame, -1, op_errno, NULL, NULL);
+
+	return 0;
+}
+
+int32_t
+map_access (call_frame_t *frame,
+	    xlator_t *this,
+	    loc_t *loc,
+	    int32_t mask)
+{
+	int32_t op_errno = 1;
+	xlator_t *subvol   = NULL;
+
+        VALIDATE_OR_GOTO (frame, err);
+        VALIDATE_OR_GOTO (this, err);
+        VALIDATE_OR_GOTO (loc, err);
+        VALIDATE_OR_GOTO (loc->inode, err);
+        VALIDATE_OR_GOTO (loc->path, err);
+
+	subvol = get_mapping_subvol_from_ctx (this, loc->inode);
+	if (!subvol) {
+		op_errno = EINVAL;
+		goto err;
+	}
+
+	STACK_WIND (frame,
+		    default_access_cbk,
+		    subvol,
+		    subvol->fops->access,
+		    loc,
+		    mask);
+	return 0;
+ err:
+	STACK_UNWIND (frame, -1, op_errno, NULL, NULL);
+
+	return 0;
+}
+
+
+int32_t
+map_readlink (call_frame_t *frame,
+	      xlator_t *this,
+	      loc_t *loc,
+	      size_t size)
+{
+	int32_t op_errno = 1;
+	xlator_t *subvol   = NULL;
+
+        VALIDATE_OR_GOTO (frame, err);
+        VALIDATE_OR_GOTO (this, err);
+        VALIDATE_OR_GOTO (loc, err);
+        VALIDATE_OR_GOTO (loc->inode, err);
+        VALIDATE_OR_GOTO (loc->path, err);
+
+	subvol = get_mapping_subvol_from_ctx (this, loc->inode);
+	if (!subvol) {
+		op_errno = EINVAL;
+		goto err;
+	}
+
+	STACK_WIND (frame,
+		    default_readlink_cbk,
+		    subvol,
+		    subvol->fops->readlink,
+		    loc,
+		    size);
+	return 0;
+ err:
+	STACK_UNWIND (frame, -1, op_errno, NULL, NULL);
+
+	return 0;
+}
+
+int32_t
+map_unlink (call_frame_t *frame,
+	    xlator_t *this,
+	    loc_t *loc)
+{
+	int32_t op_errno = 1;
+	xlator_t *subvol   = NULL;
+
+        VALIDATE_OR_GOTO (frame, err);
+        VALIDATE_OR_GOTO (this, err);
+        VALIDATE_OR_GOTO (loc, err);
+        VALIDATE_OR_GOTO (loc->inode, err);
+        VALIDATE_OR_GOTO (loc->path, err);
+
+	subvol = get_mapping_subvol_from_ctx (this, loc->inode);
+	if (!subvol) {
+		op_errno = EINVAL;
+		goto err;
+	}
+
+	STACK_WIND (frame,
+		    default_unlink_cbk,
+		    subvol,
+		    subvol->fops->unlink,
+		    loc);
+	return 0;
+ err:
+	STACK_UNWIND (frame, -1, op_errno, NULL, NULL);
+
+	return 0;
+}
+
+int32_t
+map_rmdir (call_frame_t *frame,
+	   xlator_t *this,
+	   loc_t *loc)
+{
+	int32_t op_errno = 1;
+	xlator_t *subvol   = NULL;
+
+        VALIDATE_OR_GOTO (frame, err);
+        VALIDATE_OR_GOTO (this, err);
+        VALIDATE_OR_GOTO (loc, err);
+        VALIDATE_OR_GOTO (loc->inode, err);
+        VALIDATE_OR_GOTO (loc->path, err);
+
+	subvol = get_mapping_subvol_from_ctx (this, loc->inode);
+	if (!subvol) {
+		op_errno = EINVAL;
+		goto err;
+	}
+
+	STACK_WIND (frame,
+		    default_rmdir_cbk,
+		    subvol,
+		    subvol->fops->rmdir,
+		    loc);
+	return 0;
+ err:
+	STACK_UNWIND (frame, -1, op_errno, NULL, NULL);
+
+	return 0;
+}
+
+
+int32_t
+map_rename (call_frame_t *frame,
+	    xlator_t *this,
+	    loc_t *oldloc,
+	    loc_t *newloc)
+{
+	int32_t op_errno = 1;
+	xlator_t *old_subvol = NULL;
+	xlator_t *new_subvol = NULL;
+
+        VALIDATE_OR_GOTO (frame, err);
+        VALIDATE_OR_GOTO (this, err);
+        VALIDATE_OR_GOTO (oldloc, err);
+        VALIDATE_OR_GOTO (oldloc->inode, err);
+        VALIDATE_OR_GOTO (oldloc->path, err);
+        VALIDATE_OR_GOTO (newloc, err);
+
+	old_subvol = get_mapping_subvol_from_ctx (this, oldloc->inode);
+	if (!old_subvol) {
+		op_errno = EINVAL;
+		goto err;
+	}
+
+	if (newloc->path) {
+		new_subvol = get_mapping_subvol_from_path (this, 
+							   newloc->path);
+		if (new_subvol && (new_subvol != old_subvol)) {
+			op_errno = EXDEV;
+			goto err;
+		}
+	}
+
+	STACK_WIND (frame,
+		    default_rename_cbk,
+		    old_subvol,
+		    old_subvol->fops->rename,
+		    oldloc, newloc);
+	return 0;
+ err:
+	STACK_UNWIND (frame, -1, op_errno, NULL, NULL);
+
+	return 0;
+}
+
+
+int32_t
+map_link (call_frame_t *frame,
+	  xlator_t *this,
+	  loc_t *oldloc,
+	  loc_t *newloc)
+{
+	int32_t op_errno = 1;
+	xlator_t *old_subvol = NULL;
+	xlator_t *new_subvol = NULL;
+
+        VALIDATE_OR_GOTO (frame, err);
+        VALIDATE_OR_GOTO (this, err);
+        VALIDATE_OR_GOTO (oldloc, err);
+        VALIDATE_OR_GOTO (oldloc->inode, err);
+        VALIDATE_OR_GOTO (oldloc->path, err);
+        VALIDATE_OR_GOTO (newloc, err);
+
+	old_subvol = get_mapping_subvol_from_ctx (this, oldloc->inode);
+	if (!old_subvol) {
+		op_errno = EINVAL;
+		goto err;
+	}
+
+	if (newloc->path) {
+		new_subvol = get_mapping_subvol_from_path (this, 
+							   newloc->path);
+		if (new_subvol && (new_subvol != old_subvol)) {
+			op_errno = EXDEV;
+			goto err;
+		}
+	}
+
+	STACK_WIND (frame,
+		    default_link_cbk,
+		    old_subvol,
+		    old_subvol->fops->link,
+		    oldloc, newloc);
+	return 0;
+ err:
+	STACK_UNWIND (frame, -1, op_errno, NULL, NULL);
+
+	return 0;
+}
+
+
+int32_t
+map_open (call_frame_t *frame,
+	  xlator_t *this,
+	  loc_t *loc,
+	  int32_t flags, fd_t *fd)
+{
+	int32_t op_errno = 1;
+	xlator_t *subvol   = NULL;
+
+        VALIDATE_OR_GOTO (frame, err);
+        VALIDATE_OR_GOTO (this, err);
+        VALIDATE_OR_GOTO (loc, err);
+        VALIDATE_OR_GOTO (loc->inode, err);
+        VALIDATE_OR_GOTO (loc->path, err);
+
+	subvol = get_mapping_subvol_from_ctx (this, loc->inode);
+	if (!subvol) {
+		op_errno = EINVAL;
+		goto err;
+	}
+
+	STACK_WIND (frame,
+		    default_open_cbk,
+		    subvol,
+		    subvol->fops->open,
+		    loc, flags, fd);
+	return 0;
+ err:
+	STACK_UNWIND (frame, -1, op_errno, NULL, NULL);
+
+	return 0;
+}
+
+int32_t
+map_readv (call_frame_t *frame,
+	   xlator_t *this,
+	   fd_t *fd,
+	   size_t size,
+	   off_t offset)
+{
+	int32_t op_errno = 1;
+	xlator_t *subvol   = NULL;
+
+        VALIDATE_OR_GOTO (frame, err);
+        VALIDATE_OR_GOTO (this, err);
+        VALIDATE_OR_GOTO (fd, err);
+        VALIDATE_OR_GOTO (fd->inode, err);
+
+	subvol = get_mapping_subvol_from_ctx (this, fd->inode);
+	if (!subvol) {
+		op_errno = EINVAL;
+		goto err;
+	}
+
+	STACK_WIND (frame,
+		    default_readv_cbk,
+		    subvol,
+		    subvol->fops->readv,
+		    fd,
+		    size,
+		    offset);
+	return 0;
+ err:
+	STACK_UNWIND (frame, -1, op_errno, NULL, NULL);
+
+	return 0;
+}
+
+int32_t
+map_writev (call_frame_t *frame,
+	    xlator_t *this,
+	    fd_t *fd,
+	    struct iovec *vector,
+	    int32_t count,
+	    off_t off)
+{
+	int32_t op_errno = 1;
+	xlator_t *subvol   = NULL;
+
+        VALIDATE_OR_GOTO (frame, err);
+        VALIDATE_OR_GOTO (this, err);
+        VALIDATE_OR_GOTO (fd, err);
+        VALIDATE_OR_GOTO (fd->inode, err);
+
+	subvol = get_mapping_subvol_from_ctx (this, fd->inode);
+	if (!subvol) {
+		op_errno = EINVAL;
+		goto err;
+	}
+
+	STACK_WIND (frame,
+		    default_writev_cbk,
+		    subvol,
+		    subvol->fops->writev,
+		    fd,
+		    vector,
+		    count,
+		    off);
+	return 0;
+ err:
+	STACK_UNWIND (frame, -1, op_errno, NULL, NULL);
+
+	return 0;
+}
+
+int32_t
+map_flush (call_frame_t *frame,
+	   xlator_t *this,
+	   fd_t *fd)
+{
+	int32_t op_errno = 1;
+	xlator_t *subvol   = NULL;
+
+        VALIDATE_OR_GOTO (frame, err);
+        VALIDATE_OR_GOTO (this, err);
+        VALIDATE_OR_GOTO (fd, err);
+        VALIDATE_OR_GOTO (fd->inode, err);
+
+	subvol = get_mapping_subvol_from_ctx (this, fd->inode);
+	if (!subvol) {
+		op_errno = EINVAL;
+		goto err;
+	}
+
+	STACK_WIND (frame,
+		    default_flush_cbk,
+		    subvol,
+		    subvol->fops->flush,
+		    fd);
+	return 0;
+ err:
+	STACK_UNWIND (frame, -1, op_errno, NULL, NULL);
+
+	return 0;
+}
+
+
+int32_t
+map_fsync (call_frame_t *frame,
+	   xlator_t *this,
+	   fd_t *fd,
+	   int32_t flags)
+{
+	int32_t op_errno = 1;
+	xlator_t *subvol   = NULL;
+
+        VALIDATE_OR_GOTO (frame, err);
+        VALIDATE_OR_GOTO (this, err);
+        VALIDATE_OR_GOTO (fd, err);
+        VALIDATE_OR_GOTO (fd->inode, err);
+
+	subvol = get_mapping_subvol_from_ctx (this, fd->inode);
+	if (!subvol) {
+		op_errno = EINVAL;
+		goto err;
+	}
+
+	STACK_WIND (frame,
+		    default_fsync_cbk,
+		    subvol,
+		    subvol->fops->fsync,
+		    fd,
+		    flags);
+	return 0;
+ err:
+	STACK_UNWIND (frame, -1, op_errno, NULL, NULL);
+
+	return 0;
+}
+
+int32_t
+map_fstat (call_frame_t *frame,
+	   xlator_t *this,
+	   fd_t *fd)
+{
+	int32_t op_errno = 1;
+	xlator_t *subvol   = NULL;
+
+        VALIDATE_OR_GOTO (frame, err);
+        VALIDATE_OR_GOTO (this, err);
+        VALIDATE_OR_GOTO (fd, err);
+        VALIDATE_OR_GOTO (fd->inode, err);
+
+	subvol = get_mapping_subvol_from_ctx (this, fd->inode);
+	if (!subvol) {
+		op_errno = EINVAL;
+		goto err;
+	}
+
+	STACK_WIND (frame,
+		    default_fstat_cbk,
+		    subvol,
+		    subvol->fops->fstat,
+		    fd);
+	return 0;
+ err:
+	STACK_UNWIND (frame, -1, op_errno, NULL, NULL);
+
+	return 0;
+}
+
+int32_t
+map_getdents (call_frame_t *frame,
+	      xlator_t *this,
+	      fd_t *fd,
+	      size_t size,
+	      off_t offset,
+	      int32_t flag)
+{
+	int32_t op_errno = 1;
+	xlator_t *subvol   = NULL;
+
+        VALIDATE_OR_GOTO (frame, err);
+        VALIDATE_OR_GOTO (this, err);
+        VALIDATE_OR_GOTO (fd, err);
+        VALIDATE_OR_GOTO (fd->inode, err);
+
+	subvol = get_mapping_subvol_from_ctx (this, fd->inode);
+	if (!subvol) {
+		op_errno = EINVAL;
+		goto err;
+	}
+
+	STACK_WIND (frame,
+		    default_getdents_cbk,
+		    subvol,
+		    subvol->fops->getdents,
+		    fd,
+		    size,
+		    offset,
+		    flag);
+	return 0;
+ err:
+	STACK_UNWIND (frame, -1, op_errno, NULL, NULL);
+
+	return 0;
+}
+
+int32_t
+map_setdents (call_frame_t *frame,
+	      xlator_t *this,
+	      fd_t *fd,
+	      int32_t flags,
+	      dir_entry_t *entries,
+	      int32_t count)
+{
+	int32_t op_errno = 1;
+	xlator_t *subvol   = NULL;
+
+        VALIDATE_OR_GOTO (frame, err);
+        VALIDATE_OR_GOTO (this, err);
+        VALIDATE_OR_GOTO (fd, err);
+        VALIDATE_OR_GOTO (fd->inode, err);
+
+	subvol = get_mapping_subvol_from_ctx (this, fd->inode);
+	if (!subvol) {
+		op_errno = EINVAL;
+		goto err;
+	}
+
+	STACK_WIND (frame,
+		    default_setdents_cbk,
+		    subvol,
+		    subvol->fops->setdents,
+		    fd,
+		    flags,
+		    entries,
+		    count);
+	return 0;
+ err:
+	STACK_UNWIND (frame, -1, op_errno, NULL, NULL);
+
+	return 0;
+}
+
+
+int32_t
+map_fsyncdir (call_frame_t *frame,
+	      xlator_t *this,
+	      fd_t *fd,
+	      int32_t flags)
+{
+	int32_t op_errno = 1;
+	xlator_t *subvol   = NULL;
+
+        VALIDATE_OR_GOTO (frame, err);
+        VALIDATE_OR_GOTO (this, err);
+        VALIDATE_OR_GOTO (fd, err);
+        VALIDATE_OR_GOTO (fd->inode, err);
+
+	subvol = get_mapping_subvol_from_ctx (this, fd->inode);
+	if (!subvol) {
+		op_errno = EINVAL;
+		goto err;
+	}
+
+	STACK_WIND (frame,
+		    default_fsyncdir_cbk,
+		    subvol,
+		    subvol->fops->fsyncdir,
+		    fd,
+		    flags);
+	return 0;
+ err:
+	STACK_UNWIND (frame, -1, op_errno, NULL, NULL);
+
+	return 0;
+}
+
+
+
+
+int32_t
+map_setxattr (call_frame_t *frame,
+	      xlator_t *this,
+	      loc_t *loc,
+	      dict_t *dict,
+	      int32_t flags)
+{
+	/* TODO: support for 'get' 'put' API */
+	int32_t op_errno = 1;
+	xlator_t *subvol   = NULL;
+
+        VALIDATE_OR_GOTO (frame, err);
+        VALIDATE_OR_GOTO (this, err);
+        VALIDATE_OR_GOTO (loc, err);
+        VALIDATE_OR_GOTO (loc->inode, err);
+        VALIDATE_OR_GOTO (loc->path, err);
+
+	subvol = get_mapping_subvol_from_ctx (this, loc->inode);
+	if (!subvol) {
+		op_errno = EINVAL;
+		goto err;
+	}
+
+	STACK_WIND (frame,
+		    default_setxattr_cbk,
+		    subvol,
+		    subvol->fops->setxattr,
+		    loc,
+		    dict,
+		    flags);
+	return 0;
+ err:
+	STACK_UNWIND (frame, -1, op_errno, NULL, NULL);
+
+	return 0;
+}
+
+int32_t
+map_getxattr (call_frame_t *frame,
+	      xlator_t *this,
+	      loc_t *loc,
+	      const char *name)
+{
+	/* TODO: support for 'get' 'put' API */
+	int32_t op_errno = 1;
+	xlator_t *subvol   = NULL;
+
+        VALIDATE_OR_GOTO (frame, err);
+        VALIDATE_OR_GOTO (this, err);
+        VALIDATE_OR_GOTO (loc, err);
+        VALIDATE_OR_GOTO (loc->inode, err);
+        VALIDATE_OR_GOTO (loc->path, err);
+
+	subvol = get_mapping_subvol_from_ctx (this, loc->inode);
+	if (!subvol) {
+		op_errno = EINVAL;
+		goto err;
+	}
+
+	STACK_WIND (frame,
+		    default_getxattr_cbk,
+		    subvol,
+		    subvol->fops->getxattr,
+		    loc,
+		    name);
+	return 0;
+ err:
+	STACK_UNWIND (frame, -1, op_errno, NULL, NULL);
+
+	return 0;
+}
+
+int32_t
+map_xattrop (call_frame_t *frame,
+	     xlator_t *this,
+	     loc_t *loc,
+	     gf_xattrop_flags_t flags,
+	     dict_t *dict)
+{
+	int32_t op_errno = 1;
+	xlator_t *subvol   = NULL;
+
+        VALIDATE_OR_GOTO (frame, err);
+        VALIDATE_OR_GOTO (this, err);
+        VALIDATE_OR_GOTO (loc, err);
+        VALIDATE_OR_GOTO (loc->inode, err);
+        VALIDATE_OR_GOTO (loc->path, err);
+
+	subvol = get_mapping_subvol_from_ctx (this, loc->inode);
+	if (!subvol) {
+		op_errno = EINVAL;
+		goto err;
+	}
+
+	STACK_WIND (frame,
+		    default_xattrop_cbk,
+		    subvol,
+		    subvol->fops->xattrop,
+		    loc,
+		    flags,
+		    dict);
+	return 0;
+ err:
+	STACK_UNWIND (frame, -1, op_errno, NULL, NULL);
+
+	return 0;
+}
+
+int32_t
+map_fxattrop (call_frame_t *frame,
+	      xlator_t *this,
+	      fd_t *fd,
+	      gf_xattrop_flags_t flags,
+	      dict_t *dict)
+{
+	int32_t op_errno = 1;
+	xlator_t *subvol   = NULL;
+
+        VALIDATE_OR_GOTO (frame, err);
+        VALIDATE_OR_GOTO (this, err);
+        VALIDATE_OR_GOTO (fd, err);
+        VALIDATE_OR_GOTO (fd->inode, err);
+
+	subvol = get_mapping_subvol_from_ctx (this, fd->inode);
+	if (!subvol) {
+		op_errno = EINVAL;
+		goto err;
+	}
+
+	STACK_WIND (frame,
+		    default_fxattrop_cbk,
+		    subvol,
+		    subvol->fops->fxattrop,
+		    fd,
+		    flags,
+		    dict);
+	return 0;
+ err:
+	STACK_UNWIND (frame, -1, op_errno, NULL, NULL);
+
+	return 0;
+}
+
+int32_t
+map_removexattr (call_frame_t *frame,
+		 xlator_t *this,
+		 loc_t *loc,
+		 const char *name)
+{
+	int32_t op_errno = 1;
+	xlator_t *subvol   = NULL;
+
+        VALIDATE_OR_GOTO (frame, err);
+        VALIDATE_OR_GOTO (this, err);
+        VALIDATE_OR_GOTO (loc, err);
+        VALIDATE_OR_GOTO (loc->inode, err);
+        VALIDATE_OR_GOTO (loc->path, err);
+
+	subvol = get_mapping_subvol_from_ctx (this, loc->inode);
+	if (!subvol) {
+		op_errno = EINVAL;
+		goto err;
+	}
+
+	STACK_WIND (frame,
+		    default_removexattr_cbk,
+		    subvol,
+		    subvol->fops->removexattr,
+		    loc,
+		    name);
+	return 0;
+ err:
+	STACK_UNWIND (frame, -1, op_errno, NULL, NULL);
+
+	return 0;
+}
+
+int32_t
+map_lk (call_frame_t *frame,
+	xlator_t *this,
+	fd_t *fd,
+	int32_t cmd,
+	struct flock *lock)
+{
+	int32_t op_errno = 1;
+	xlator_t *subvol   = NULL;
+
+        VALIDATE_OR_GOTO (frame, err);
+        VALIDATE_OR_GOTO (this, err);
+        VALIDATE_OR_GOTO (fd, err);
+        VALIDATE_OR_GOTO (fd->inode, err);
+
+	subvol = get_mapping_subvol_from_ctx (this, fd->inode);
+	if (!subvol) {
+		op_errno = EINVAL;
+		goto err;
+	}
+
+	STACK_WIND (frame,
+		    default_lk_cbk,
+		    subvol,
+		    subvol->fops->lk,
+		    fd,
+		    cmd,
+		    lock);
+	return 0;
+ err:
+	STACK_UNWIND (frame, -1, op_errno, NULL, NULL);
+
+	return 0;
+}
+
+
+int32_t
+map_inodelk (call_frame_t *frame, xlator_t *this,
+	     loc_t *loc, int32_t cmd, struct flock *lock)
+{
+	int32_t op_errno = 1;
+	xlator_t *subvol   = NULL;
+
+        VALIDATE_OR_GOTO (frame, err);
+        VALIDATE_OR_GOTO (this, err);
+        VALIDATE_OR_GOTO (loc, err);
+        VALIDATE_OR_GOTO (loc->inode, err);
+        VALIDATE_OR_GOTO (loc->path, err);
+
+	subvol = get_mapping_subvol_from_ctx (this, loc->inode);
+	if (!subvol) {
+		op_errno = EINVAL;
+		goto err;
+	}
+
+	STACK_WIND (frame,
+		    default_inodelk_cbk,
+		    subvol,
+		    subvol->fops->inodelk,
+		    loc, cmd, lock);
+	return 0;
+ err:
+	STACK_UNWIND (frame, -1, op_errno, NULL, NULL);
+
+	return 0;
+}
+
+
+int32_t
+map_finodelk (call_frame_t *frame, xlator_t *this,
+	      fd_t *fd, int32_t cmd, struct flock *lock)
+{
+	int32_t op_errno = 1;
+	xlator_t *subvol   = NULL;
+
+        VALIDATE_OR_GOTO (frame, err);
+        VALIDATE_OR_GOTO (this, err);
+        VALIDATE_OR_GOTO (fd, err);
+        VALIDATE_OR_GOTO (fd->inode, err);
+
+	subvol = get_mapping_subvol_from_ctx (this, fd->inode);
+	if (!subvol) {
+		op_errno = EINVAL;
+		goto err;
+	}
+
+	STACK_WIND (frame,
+		    default_finodelk_cbk,
+		    subvol,
+		    subvol->fops->finodelk,
+		    fd, cmd, lock);
+	return 0;
+ err:
+	STACK_UNWIND (frame, -1, op_errno, NULL, NULL);
+
+	return 0;
+}
+
+int32_t
+map_entrylk (call_frame_t *frame, xlator_t *this,
+	     loc_t *loc, const char *basename,
+	     entrylk_cmd cmd, entrylk_type type)
+{
+	int32_t op_errno = 1;
+	xlator_t *subvol   = NULL;
+
+        VALIDATE_OR_GOTO (frame, err);
+        VALIDATE_OR_GOTO (this, err);
+        VALIDATE_OR_GOTO (loc, err);
+        VALIDATE_OR_GOTO (loc->inode, err);
+        VALIDATE_OR_GOTO (loc->path, err);
+
+	subvol = get_mapping_subvol_from_ctx (this, loc->inode);
+	if (!subvol) {
+		op_errno = EINVAL;
+		goto err;
+	}
+
+	STACK_WIND (frame, default_entrylk_cbk,
+		    subvol,
+		    subvol->fops->entrylk,
+		    loc, basename, cmd, type);
+	return 0;
+ err:
+	STACK_UNWIND (frame, -1, op_errno, NULL, NULL);
+
+	return 0;
+}
+
+int32_t
+map_fentrylk (call_frame_t *frame, xlator_t *this,
+	      fd_t *fd, const char *basename,
+	      entrylk_cmd cmd, entrylk_type type)
+{
+	int32_t op_errno = 1;
+	xlator_t *subvol   = NULL;
+
+        VALIDATE_OR_GOTO (frame, err);
+        VALIDATE_OR_GOTO (this, err);
+        VALIDATE_OR_GOTO (fd, err);
+        VALIDATE_OR_GOTO (fd->inode, err);
+
+	subvol = get_mapping_subvol_from_ctx (this, fd->inode);
+	if (!subvol) {
+		op_errno = EINVAL;
+		goto err;
+	}
+
+	STACK_WIND (frame, default_fentrylk_cbk,
+		    subvol,
+		    subvol->fops->fentrylk,
+		    fd, basename, cmd, type);
+	return 0;
+ err:
+	STACK_UNWIND (frame, -1, op_errno, NULL, NULL);
+
+	return 0;
+}
+
+int32_t
+map_checksum (call_frame_t *frame,
+	      xlator_t *this,
+	      loc_t *loc,
+	      int32_t flag)
+{
+	int32_t op_errno = 1;
+	xlator_t *subvol   = NULL;
+
+        VALIDATE_OR_GOTO (frame, err);
+        VALIDATE_OR_GOTO (this, err);
+        VALIDATE_OR_GOTO (loc, err);
+        VALIDATE_OR_GOTO (loc->inode, err);
+        VALIDATE_OR_GOTO (loc->path, err);
+
+	subvol = get_mapping_subvol_from_ctx (this, loc->inode);
+	if (!subvol) {
+		op_errno = EINVAL;
+		goto err;
+	}
+
+	STACK_WIND (frame,
+		    default_checksum_cbk,
+		    subvol,
+		    subvol->fops->checksum,
+		    loc,
+		    flag);
+	return 0;
+ err:
+	STACK_UNWIND (frame, -1, op_errno, NULL, NULL);
+
+	return 0;
+}
+
+static int32_t
+map_newentry_cbk (call_frame_t *frame,
+		  void *cookie,
+		  xlator_t *this,
+		  int32_t op_ret,
+		  int32_t op_errno,
+		  inode_t *inode,
+		  struct stat *buf)
+{
+        call_frame_t *prev = NULL;
+        prev  = cookie;
+	
+	map_itransform (this, prev->this, buf->st_ino, &buf->st_ino);
+
+	STACK_UNWIND (frame, op_ret, op_errno, inode, buf);
+	return 0;
+
+}
+
+
+int32_t
+map_mknod (call_frame_t *frame,
+	   xlator_t *this,
+	   loc_t *loc,
+	   mode_t mode,
+	   dev_t rdev)
+{
+	int32_t op_errno = 1;
+	xlator_t *subvol   = NULL;
+
+        VALIDATE_OR_GOTO (frame, err);
+        VALIDATE_OR_GOTO (this, err);
+        VALIDATE_OR_GOTO (loc, err);
+        VALIDATE_OR_GOTO (loc->path, err);
+        VALIDATE_OR_GOTO (loc->inode, err);
+
+	subvol = get_mapping_subvol_from_path (this, loc->path);
+	if (!subvol) {
+		op_errno = EINVAL;
+		goto err;
+	}
+	
+	op_errno = inode_ctx_put (loc->inode, this, (uint64_t)(long)subvol);
+	if (op_errno != 0) {
+		gf_log (this->name, GF_LOG_ERROR,
+			"%s: failed to set subvolume ptr in inode ctx",
+			loc->path);
+	}
+
+	STACK_WIND (frame,
+		    map_newentry_cbk,
+		    subvol,
+		    subvol->fops->mknod,
+		    loc, mode, rdev);
+	return 0;
+ err:
+	STACK_UNWIND (frame, -1, op_errno, NULL, NULL);
+
+	return 0;
+}
+
+int32_t
+map_mkdir (call_frame_t *frame,
+	   xlator_t *this,
+	   loc_t *loc,
+	   mode_t mode)
+{
+	int32_t op_errno = 1;
+	xlator_t *subvol   = NULL;
+
+        VALIDATE_OR_GOTO (frame, err);
+        VALIDATE_OR_GOTO (this, err);
+        VALIDATE_OR_GOTO (loc, err);
+        VALIDATE_OR_GOTO (loc->path, err);
+        VALIDATE_OR_GOTO (loc->inode, err);
+
+	subvol = get_mapping_subvol_from_path (this, loc->path);
+	if (!subvol) {
+		op_errno = EINVAL;
+		goto err;
+	}
+
+	op_errno = inode_ctx_put (loc->inode, this, (uint64_t)(long)subvol);
+	if (op_errno != 0) {
+		gf_log (this->name, GF_LOG_ERROR,
+			"%s: failed to set subvolume ptr in inode ctx",
+			loc->path);
+	}
+
+	STACK_WIND (frame,
+		    map_newentry_cbk,
+		    subvol,
+		    subvol->fops->mkdir,
+		    loc, mode);
+	return 0;
+ err:
+	STACK_UNWIND (frame, -1, op_errno, NULL, NULL);
+
+	return 0;
+}
+
+
+int32_t
+map_symlink (call_frame_t *frame,
+	     xlator_t *this,
+	     const char *linkpath,
+	     loc_t *loc)
+{
+	int32_t op_errno = 1;
+	xlator_t *subvol   = NULL;
+
+        VALIDATE_OR_GOTO (frame, err);
+        VALIDATE_OR_GOTO (this, err);
+        VALIDATE_OR_GOTO (loc, err);
+        VALIDATE_OR_GOTO (loc->path, err);
+        VALIDATE_OR_GOTO (loc->inode, err);
+
+	subvol = get_mapping_subvol_from_path (this, loc->path);
+	if (!subvol) {
+		op_errno = EINVAL;
+		goto err;
+	}
+	
+	op_errno = inode_ctx_put (loc->inode, this, (uint64_t)(long)subvol);
+	if (op_errno != 0) {
+		gf_log (this->name, GF_LOG_ERROR,
+			"%s: failed to set subvolume ptr in inode ctx",
+			loc->path);
+	}
+
+	STACK_WIND (frame,
+		    map_newentry_cbk,
+		    subvol,
+		    subvol->fops->symlink,
+		    linkpath, loc);
+	return 0;
+ err:
+	STACK_UNWIND (frame, -1, op_errno, NULL, NULL);
+
+	return 0;
+}
+
+
+static int32_t
+map_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 stat *buf)
+{
+        call_frame_t *prev = NULL;
+        prev  = cookie;
+	
+	map_itransform (this, prev->this, buf->st_ino, &buf->st_ino);
+	STACK_UNWIND (frame, op_ret, op_errno, fd, inode, buf);
+	return 0;
+}
+
+int32_t
+map_create (call_frame_t *frame,
+	    xlator_t *this,
+	    loc_t *loc,
+	    int32_t flags,
+	    mode_t mode, fd_t *fd)
+{
+	int32_t op_errno = 1;
+	xlator_t *subvol   = NULL;
+
+        VALIDATE_OR_GOTO (frame, err);
+        VALIDATE_OR_GOTO (this, err);
+        VALIDATE_OR_GOTO (loc, err);
+        VALIDATE_OR_GOTO (loc->path, err);
+        VALIDATE_OR_GOTO (loc->inode, err);
+
+	subvol = get_mapping_subvol_from_path (this, loc->path);
+	if (!subvol) {
+		op_errno = EINVAL;
+		goto err;
+	}
+
+	op_errno = inode_ctx_put (loc->inode, this, (uint64_t)(long)subvol);
+	if (op_errno != 0) {
+		gf_log (this->name, GF_LOG_ERROR,
+			"%s: failed to set subvolume ptr in inode ctx",
+			loc->path);
+	}
+
+	STACK_WIND (frame, map_create_cbk,
+		    subvol,
+		    subvol->fops->create,
+		    loc, flags, mode, fd);
+	return 0;
+ err:
+	STACK_UNWIND (frame, -1, op_errno, NULL, NULL);
+
+	return 0;
+}
+
+int32_t
+map_single_lookup_cbk (call_frame_t *frame,
+		       void *cookie,
+		       xlator_t *this,
+		       int32_t op_ret,
+		       int32_t op_errno,
+		       inode_t *inode,
+		       struct stat *buf,
+		       dict_t *dict)
+{
+        call_frame_t *prev = NULL;
+        prev  = cookie;
+	
+	map_itransform (this, prev->this, buf->st_ino, &buf->st_ino);
+
+	STACK_UNWIND (frame, op_ret, op_errno, inode, buf, dict);
+
+	return 0;
+}
+
+int32_t
+map_lookup_cbk (call_frame_t *frame,
+		void *cookie,
+		xlator_t *this,
+		int32_t op_ret,
+		int32_t op_errno,
+		inode_t *inode,
+		struct stat *buf,
+		dict_t *dict)
+{
+	int callcnt = 0;
+	map_local_t *local = NULL;
+	inode_t *tmp_inode = NULL;
+	dict_t *tmp_dict = NULL;
+
+	local = frame->local;
+	LOCK (&frame->lock);
+	{
+		callcnt = --local->call_count;
+		if ((op_ret == 0) && (local->op_ret == -1)) {
+			local->op_ret = 0;
+			local->stbuf = *buf;
+			if (dict)
+				local->dict = dict_ref (dict);
+			local->inode = inode_ref (inode);
+		}
+		if (op_ret == -1)
+			local->op_errno = op_errno;
+		
+	}
+	UNLOCK (&frame->lock);
+
+	if (!callcnt) {
+		tmp_dict = local->dict;
+		tmp_inode = local->inode;
+
+		STACK_UNWIND (frame, local->op_ret, 
+			      local->op_errno, local->inode, 
+			      &local->stbuf, local->dict);
+
+		inode_unref (local->inode);
+		if (tmp_dict)
+			dict_unref (tmp_dict);
+	}
+
+	return 0;
+}
+
+int32_t
+map_lookup (call_frame_t *frame,
+	    xlator_t *this,
+	    loc_t *loc,
+	    dict_t *xattr_req)
+{
+	int32_t op_errno = EINVAL;
+	xlator_t *subvol   = NULL;
+	map_local_t *local = NULL;
+	map_private_t *priv = NULL;
+	xlator_list_t *trav = NULL;
+
+        VALIDATE_OR_GOTO (frame, err);
+        VALIDATE_OR_GOTO (this, err);
+        VALIDATE_OR_GOTO (loc, err);
+        VALIDATE_OR_GOTO (loc->path, err);
+        VALIDATE_OR_GOTO (loc->inode, err);
+
+	priv = this->private;
+
+	if (loc->inode->ino == 1)
+		goto root_inode;
+
+	subvol = get_mapping_subvol_from_ctx (this, loc->inode);
+	if (!subvol) {
+		subvol = get_mapping_subvol_from_path (this, loc->path);
+		if (!subvol) {
+			goto err;
+		}
+
+		op_errno = inode_ctx_put (loc->inode, this, 
+					  (uint64_t)(long)subvol);
+		if (op_errno != 0) {
+			gf_log (this->name, GF_LOG_ERROR,
+				"%s: failed to set subvolume in inode ctx",
+				loc->path);
+		}
+	}
+
+	/* Just one callback */
+	STACK_WIND (frame,
+		    map_single_lookup_cbk,
+		    subvol,
+		    subvol->fops->lookup,
+		    loc,
+		    xattr_req);
+
+	return 0;
+
+ root_inode:
+	local = CALLOC (1, sizeof (map_local_t));
+
+	frame->local = local;
+	local->call_count = priv->child_count;
+	local->op_ret = -1;
+
+	trav = this->children;
+	while (trav) {
+		STACK_WIND (frame,
+			    map_lookup_cbk,
+			    trav->xlator,
+			    trav->xlator->fops->lookup,
+			    loc,
+			    xattr_req);
+		trav = trav->next;
+	}
+
+	return 0;
+
+ err:
+	STACK_UNWIND (frame, -1, op_errno, NULL, NULL);
+
+	return 0;
+}
+/*
+ * unify_normalize_stats -
+ */
+void
+map_normalize_stats (struct statvfs *buf,
+		     unsigned long bsize,
+		     unsigned long frsize)
+{
+	double factor;
+
+	if (buf->f_bsize != bsize) {
+		factor = ((double) buf->f_bsize) / bsize;
+		buf->f_bsize  = bsize;
+		buf->f_bfree  = (fsblkcnt_t) (factor * buf->f_bfree);
+		buf->f_bavail = (fsblkcnt_t) (factor * buf->f_bavail);
+	}
+  
+	if (buf->f_frsize != frsize) {
+		factor = ((double) buf->f_frsize) / frsize;
+		buf->f_frsize = frsize;
+		buf->f_blocks = (fsblkcnt_t) (factor * buf->f_blocks);
+	}
+}
+
+
+int32_t
+map_statfs_cbk (call_frame_t *frame,
+		void *cookie,
+		xlator_t *this,
+		int32_t op_ret,
+		int32_t op_errno,
+		struct statvfs *stbuf)
+{
+	struct statvfs *dict_buf = NULL;
+	map_local_t  *local = NULL;
+	int           this_call_cnt = 0;
+	unsigned long bsize;
+	unsigned long frsize;
+
+	local = frame->local;
+
+	LOCK (&frame->lock);
+	{
+		this_call_cnt = --local->call_count;
+
+		if (op_ret == -1) {
+			local->op_errno = op_errno;
+			goto unlock;
+		}
+		local->op_ret = 0;
+		
+		/* when a call is successfull, add it to local->dict */
+		dict_buf = &local->statvfs;
+		
+		if (dict_buf->f_bsize != 0) {
+			bsize  = max (dict_buf->f_bsize, 
+				      stbuf->f_bsize);
+			
+			frsize = max (dict_buf->f_frsize, 
+				      stbuf->f_frsize);
+			map_normalize_stats(dict_buf, bsize, frsize);
+			map_normalize_stats(stbuf, bsize, frsize);
+		} else {
+			dict_buf->f_bsize   = stbuf->f_bsize;
+			dict_buf->f_frsize  = stbuf->f_frsize;
+		}
+		
+		dict_buf->f_blocks += stbuf->f_blocks;
+		dict_buf->f_bfree  += stbuf->f_bfree;
+		dict_buf->f_bavail += stbuf->f_bavail;
+		dict_buf->f_files  += stbuf->f_files;
+		dict_buf->f_ffree  += stbuf->f_ffree;
+		dict_buf->f_favail += stbuf->f_favail;
+		dict_buf->f_fsid    = stbuf->f_fsid;
+		dict_buf->f_flag    = stbuf->f_flag;
+		dict_buf->f_namemax = stbuf->f_namemax;
+	}
+unlock:
+	UNLOCK (&frame->lock);
+
+	if (!this_call_cnt) {
+		STACK_UNWIND (frame, local->op_ret, local->op_errno,
+			      &local->statvfs);
+	}
+
+	return 0;
+}
+
+int32_t
+map_statfs (call_frame_t *frame,
+	    xlator_t *this,
+	    loc_t *loc)
+{
+	int32_t op_errno = EINVAL;
+	xlator_t *subvol   = NULL;
+	map_local_t *local = NULL;
+	map_private_t *priv = NULL;
+	xlator_list_t *trav = NULL;
+
+        VALIDATE_OR_GOTO (frame, err);
+        VALIDATE_OR_GOTO (this, err);
+        VALIDATE_OR_GOTO (loc, err);
+        VALIDATE_OR_GOTO (loc->path, err);
+        VALIDATE_OR_GOTO (loc->inode, err);
+
+	if (loc->inode->ino == 1)
+		goto root_inode;
+	subvol = get_mapping_subvol_from_ctx (this, loc->inode);
+	if (!subvol) {
+		goto err;
+	}
+	
+	/* Just one callback */
+	STACK_WIND (frame,
+		    default_statfs_cbk,
+		    subvol,
+		    subvol->fops->statfs,
+		    loc);
+
+	return 0;
+
+ root_inode:
+	local = CALLOC (1, sizeof (map_local_t));
+
+	priv = this->private;
+	frame->local = local;
+	local->call_count = priv->child_count;
+	local->op_ret = -1;
+
+	trav = this->children;
+	while (trav) {
+		STACK_WIND (frame,
+			    map_statfs_cbk,
+			    trav->xlator,
+			    trav->xlator->fops->statfs,
+			    loc);
+		trav = trav->next;
+	}
+
+	return 0;
+ err:
+	STACK_UNWIND (frame, -1, op_errno, NULL);
+
+	return 0;
+}
+
+int32_t
+map_opendir_cbk (call_frame_t *frame,
+		 void *cookie,
+		 xlator_t *this,
+		 int32_t op_ret,
+		 int32_t op_errno,
+		 fd_t *fd)
+{
+	int callcnt = 0;
+	map_local_t *local = NULL;
+	fd_t *local_fd = NULL;
+
+	local = frame->local;
+	LOCK (&frame->lock);
+	{
+		callcnt = --local->call_count;
+
+		if (op_ret == -1) {
+			local->op_errno = op_errno;
+			goto unlock;
+		}
+
+		local->op_ret = 0;
+	}
+ unlock:
+	UNLOCK (&frame->lock);
+
+	if (!callcnt) {
+		local_fd = local->fd;
+		local->fd = NULL;
+
+		STACK_UNWIND (frame, local->op_ret, 
+			      local->op_errno, local_fd);
+
+		fd_unref (local_fd);
+	}
+	return 0;
+}
+
+
+int32_t
+map_opendir (call_frame_t *frame,
+	     xlator_t *this,
+	     loc_t *loc, fd_t *fd)
+{
+	int32_t op_errno = EINVAL;
+	xlator_t *subvol   = NULL;
+	map_local_t *local = NULL;
+	map_private_t *priv = NULL;
+	xlator_list_t *trav = NULL;
+
+        VALIDATE_OR_GOTO (frame, err);
+        VALIDATE_OR_GOTO (this, err);
+        VALIDATE_OR_GOTO (fd, err);
+        VALIDATE_OR_GOTO (fd->inode, err);
+
+	if (loc->inode->ino == 1) 
+		goto root_inode;
+	
+	subvol = get_mapping_subvol_from_ctx (this, fd->inode);
+	if (!subvol) {
+		goto err;
+	}
+	
+	/* Just one callback */
+	STACK_WIND (frame,
+		    default_opendir_cbk,
+		    subvol,
+		    subvol->fops->opendir,
+		    loc, fd);
+	return 0;
+
+ root_inode:
+	local = CALLOC (1, sizeof (map_local_t));
+
+	priv = this->private;
+	frame->local = local;
+	local->call_count = priv->child_count;
+	local->op_ret = -1;
+	local->fd = fd_ref (fd);
+
+	trav = this->children;
+	while (trav) {
+		STACK_WIND (frame,
+			    map_opendir_cbk,
+			    trav->xlator,
+			    trav->xlator->fops->opendir,
+			    loc, fd);
+		trav = trav->next;
+	}
+	
+	return 0;
+ err:
+	STACK_UNWIND (frame, -1, op_errno, NULL);
+
+	return 0;
+}
+
+
+int32_t
+map_single_readdir_cbk (call_frame_t *frame,
+			void *cookie,
+			xlator_t *this,
+			int32_t op_ret,
+			int32_t op_errno,
+			gf_dirent_t *entries)
+{
+        call_frame_t *prev = NULL;
+	gf_dirent_t  *orig_entry = NULL;
+
+        prev  = cookie;
+
+	list_for_each_entry (orig_entry, &entries->list, list) {
+		map_itransform (this, prev->this, orig_entry->d_ino, 
+				&orig_entry->d_ino);
+	}
+	STACK_UNWIND (frame, op_ret, op_errno, entries);
+	
+	return 0;
+}
+
+
+int
+map_readdir_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
+		 int op_ret, int op_errno, gf_dirent_t *orig_entries)
+{
+	map_local_t  *local = NULL;
+	gf_dirent_t   entries;
+	gf_dirent_t  *orig_entry = NULL;
+	gf_dirent_t  *entry = NULL;
+	call_frame_t *prev = NULL;
+	xlator_t     *subvol = NULL;
+	xlator_t     *next = NULL;
+	int           count = 0;
+	fd_t         *local_fd = NULL;
+
+	INIT_LIST_HEAD (&entries.list);
+	prev = cookie;
+	local = frame->local;
+
+	if (op_ret < 0)
+		goto done;
+
+	list_for_each_entry (orig_entry, &orig_entries->list, list) {
+		subvol = prev->this;
+
+		entry = gf_dirent_for_name (orig_entry->d_name);
+		if (!entry) {
+			gf_log (this->name, GF_LOG_ERROR,
+				"memory allocation failed :(");
+			goto unwind;
+		}
+		
+		map_itransform (this, subvol, orig_entry->d_ino,
+				&entry->d_ino);
+		map_itransform (this, subvol, orig_entry->d_off,
+				&entry->d_off);
+		
+		entry->d_type = orig_entry->d_type;
+		entry->d_len  = orig_entry->d_len;
+		
+		list_add_tail (&entry->list, &entries.list);
+		count++;
+	}
+
+	op_ret = count;
+
+done:
+	if (count == 0) {
+		next = map_subvol_next (this, prev->this);
+		if (!next) {
+			goto unwind;
+		}
+
+		STACK_WIND (frame, map_readdir_cbk,
+			    next, next->fops->readdir,
+			    local->fd, local->size, 0);
+		return 0;
+	}
+
+unwind:
+	if (op_ret < 0)
+		op_ret = 0;
+
+	local_fd = local->fd;
+	local->fd = NULL;
+
+	STACK_UNWIND (frame, op_ret, op_errno, &entries);
+
+	fd_unref (local_fd);
+
+	gf_dirent_free (&entries);
+
+        return 0;
+}
+
+
+int32_t
+map_readdir (call_frame_t *frame,
+	     xlator_t *this,
+	     fd_t *fd,
+	     size_t size,
+	     off_t yoff)
+{
+	int32_t        op_errno = EINVAL;
+	xlator_t      *subvol = NULL;
+	map_local_t   *local = NULL;
+	map_private_t *priv = NULL;
+	xlator_t      *xvol = NULL;
+	off_t          xoff = 0;
+
+        VALIDATE_OR_GOTO (frame, err);
+        VALIDATE_OR_GOTO (this, err);
+        VALIDATE_OR_GOTO (fd, err);
+        VALIDATE_OR_GOTO (fd->inode, err);
+
+	if (fd->inode->ino == 1) 
+		goto root_inode;
+
+	subvol = get_mapping_subvol_from_ctx (this, fd->inode);
+	if (!subvol) {
+		goto err;
+	}
+	
+	/* Just one callback */
+	
+	STACK_WIND (frame,
+		    map_single_readdir_cbk,
+		    subvol,
+		    subvol->fops->readdir,
+		    fd, size, yoff);
+	return 0;
+
+ root_inode:
+	/* readdir on '/' */
+	local = CALLOC (1, sizeof (map_local_t));
+	if (!local) {
+		gf_log (this->name, GF_LOG_ERROR,
+			"memory allocation failed :(");
+		op_errno = ENOMEM;
+		goto err;
+	}
+	
+	priv = this->private;
+	frame->local = local;
+	local->op_errno = ENOENT;
+	local->op_ret = -1;
+
+	local->fd = fd_ref (fd);
+	local->size = size;
+
+	map_deitransform (this, yoff, &xvol, (uint64_t *)&xoff);
+
+	STACK_WIND (frame, map_readdir_cbk,
+		    xvol, xvol->fops->readdir,
+		    fd, size, xoff);
+
+	return 0;
+ err:
+	STACK_UNWIND (frame, -1, op_errno, NULL);
+
+	return 0;
+}
+
+
+#if 0 
+/* TODO : do it later as currently only unify uses this mop and mostly 
+   unify will be used below map  */
+int32_t
+map_stats_cbk (call_frame_t *frame,
+	       void *cookie,
+	       xlator_t *this,
+	       int32_t op_ret,
+	       int32_t op_errno,
+	       struct xlator_stats *stats)
+{
+	STACK_UNWIND (frame, op_ret, op_errno, stats);
+	return 0;
+}
+
+
+int32_t
+map_stats (call_frame_t *frame,
+	   xlator_t *this,
+	   int32_t flags)
+{
+	STACK_WIND (frame,
+		    map_stats_cbk,
+		    subvol,
+		    subvol->mops->stats,
+		    flags);
+	return 0;
+ err:
+	STACK_UNWIND (frame, -1, op_errno, NULL, NULL);
+
+	return 0;
+}
+#endif /* if 0 */
+
+
+/* TODO: define the behavior of notify */
+
+
+void
+fini (xlator_t *this)
+{
+	map_private_t *priv = NULL;
+	struct map_pattern *trav_map = NULL;
+	struct map_pattern *tmp_map  = NULL;
+
+	priv = this->private;
+
+	if (priv) {
+		if (priv->xlarray)
+			FREE (priv->xlarray);
+
+		trav_map = priv->map;
+		while (trav_map) {
+			tmp_map = trav_map;
+			trav_map = trav_map->next;
+			FREE (tmp_map);
+		}
+
+		FREE(priv);
+	}
+
+	return;
+}
+
+int
+init (xlator_t *this)
+{
+	map_private_t *priv = NULL;
+	xlator_list_t *trav = NULL;
+	int   count = 0;
+	int   ret = -1;
+	char *pattern_string = NULL;
+	char *map_pair_str = NULL;
+	char *tmp_str = NULL;
+	char *tmp_str1 = NULL;
+	char *dup_map_pair = NULL;
+	char *dir_str = NULL;
+	char *subvol_str = NULL;
+	char *default_xl = NULL;
+
+	if (!this->children) {
+		gf_log (this->name,GF_LOG_ERROR,
+			"FATAL: map should have one or more child defined");
+		return -1;
+	}
+
+	if (!this->parents) {
+		gf_log (this->name, GF_LOG_WARNING,
+			"dangling volume. check volfile ");
+	}
+
+	priv = CALLOC (1, sizeof (map_private_t));
+	this->private = priv;
+
+	/* allocate xlator array */
+	trav = this->children;
+	while (trav) {
+		count++;
+		trav = trav->next;
+	}
+	priv->xlarray = CALLOC (1, sizeof (struct map_xlator_array) * count);
+	priv->child_count = count;
+
+	/* build xlator array */
+	count = 0;
+	trav = this->children;
+	while (trav) {
+		priv->xlarray[count++].xl = trav->xlator;
+		trav = trav->next;
+	}
+
+	/* map dir1:brick1;dir2:brick2;dir3:brick3;*:brick4 */
+	ret = dict_get_str (this->options, "map-directory", &pattern_string);
+	if (ret != 0) {
+		gf_log (this->name, GF_LOG_ERROR, 
+			"map.pattern not given, can't continue");
+		goto err;
+	}
+	map_pair_str = strtok_r (pattern_string, ";", &tmp_str);
+	while (map_pair_str) {
+		dup_map_pair = strdup (map_pair_str);
+		dir_str = strtok_r (dup_map_pair, ":", &tmp_str1);
+		if (!dir_str) {
+			gf_log (this->name, GF_LOG_ERROR, 
+				"directory string invalid");
+			goto err;
+		}
+		subvol_str = strtok_r (NULL, ":", &tmp_str1);
+		if (!subvol_str) {
+			gf_log (this->name, GF_LOG_ERROR, 
+				"mapping subvolume string invalid");
+			goto err;
+		}
+		ret = verify_dir_and_assign_subvol (this, 
+						    dir_str, 
+						    subvol_str);
+		if (ret != 0) {
+			gf_log (this->name, GF_LOG_ERROR, 
+				"verification failed");
+			goto err;
+		}
+		
+		FREE (dup_map_pair);
+
+		map_pair_str = strtok_r (NULL, ";", &tmp_str);
+	}
+
+	/* default-volume brick4 */
+	ret = dict_get_str (this->options, "default-volume", &default_xl);
+	if (ret == 0) {
+		ret = assign_default_subvol (this, default_xl);
+		if (ret != 0) {
+			gf_log (this->name, GF_LOG_ERROR, 
+				"assigning default failed");
+			goto err;
+		}
+	}
+
+	verify_if_all_subvolumes_got_used (this);
+	
+	return 0;
+ err:
+	fini (this);
+	return -1;
+}
+
+
+struct xlator_fops fops = {
+	.lookup      = map_lookup,
+	.mknod       = map_mknod,
+	.create      = map_create,
+
+	.stat        = map_stat,
+	.chmod       = map_chmod,
+	.chown       = map_chown,
+	.fchown      = map_fchown,
+	.fchmod      = map_fchmod,
+	.fstat       = map_fstat,
+	.utimens     = map_utimens,
+	.truncate    = map_truncate,
+	.ftruncate   = map_ftruncate,
+	.access      = map_access,
+	.readlink    = map_readlink,
+	.setxattr    = map_setxattr,
+	.getxattr    = map_getxattr,
+	.removexattr = map_removexattr,
+	.open        = map_open,
+	.readv       = map_readv,
+	.writev      = map_writev,
+	.flush       = map_flush,
+	.fsync       = map_fsync,
+	.statfs      = map_statfs,
+	.lk          = map_lk,
+	.opendir     = map_opendir,
+	.readdir     = map_readdir,
+	.fsyncdir    = map_fsyncdir,
+	.symlink     = map_symlink,
+	.unlink      = map_unlink,
+	.link        = map_link,
+	.mkdir       = map_mkdir,
+	.rmdir       = map_rmdir,
+	.rename      = map_rename,
+	.inodelk     = map_inodelk,
+	.finodelk    = map_finodelk,
+	.entrylk     = map_entrylk,
+	.fentrylk    = map_fentrylk,
+	.xattrop     = map_xattrop,
+	.fxattrop    = map_fxattrop,
+	.setdents    = map_setdents,
+	.getdents    = map_getdents,
+	.checksum    = map_checksum,
+};
+
+struct xlator_mops mops = {
+};
+
+struct xlator_cbks cbks = {
+};
+
+struct volume_options options[] = {
+	{ .key   = {"map-directory"},  
+	  .type  = GF_OPTION_TYPE_ANY 
+	},
+	{ .key   = {"default-volume"},  
+	  .type  = GF_OPTION_TYPE_XLATOR 
+	},
+	
+	{ .key = {NULL} }
+};
diff --git a/xlators/cluster/map/src/map.h b/xlators/cluster/map/src/map.h
new file mode 100644
index 00000000000..0f1aabfd6e3
--- /dev/null
+++ b/xlators/cluster/map/src/map.h
@@ -0,0 +1,76 @@
+/*
+  Copyright (c) 2008 Z RESEARCH, Inc. <http://www.zresearch.com>
+  This file is part of GlusterFS.
+
+  GlusterFS is free software; you can redistribute it and/or modify
+  it under the terms of the GNU General Public License as published
+  by the Free Software Foundation; either version 3 of the License,
+  or (at your option) any later version.
+
+  GlusterFS is distributed in the hope that it will be useful, but
+  WITHOUT ANY WARRANTY; without even the implied warranty of
+  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+  General Public License for more details.
+
+  You should have received a copy of the GNU General Public License
+  along with this program.  If not, see
+  <http://www.gnu.org/licenses/>.
+*/
+
+#ifndef __MAP_H__
+#define __MAP_H__
+
+#include "xlator.h"
+
+struct map_pattern {
+	struct map_pattern *next;
+	xlator_t           *xl;
+	char               *directory;
+	int                 dir_len;
+};
+
+struct map_xlator_array {
+	xlator_t *xl;
+	int       mapped; /* yes/no */
+};
+
+typedef struct {
+	struct map_pattern      *map;
+	xlator_t                *default_xl;
+	struct map_xlator_array *xlarray;
+	int                      child_count;
+} map_private_t;
+
+typedef struct {
+	int32_t        op_ret;
+	int32_t        op_errno;
+	int            call_count;
+	struct statvfs statvfs;
+	struct stat    stbuf;
+	inode_t       *inode;
+	dict_t        *dict;
+	fd_t          *fd;
+
+	size_t        size;
+} map_local_t;
+
+xlator_t *map_subvol_next (xlator_t *this, xlator_t *prev);
+int map_subvol_cnt (xlator_t *this, xlator_t *subvol);
+
+int map_itransform (xlator_t *this, xlator_t *subvol, 
+		    uint64_t x, uint64_t *y_p);
+int map_deitransform (xlator_t *this, uint64_t y, 
+		      xlator_t **subvol_p, uint64_t *x_p);
+
+
+xlator_t *get_mapping_subvol_from_path (xlator_t *this, const char *path);
+xlator_t *get_mapping_subvol_from_ctx (xlator_t *this, inode_t *inode);
+
+int check_multiple_volume_entry (xlator_t *this, xlator_t *subvol);
+int verify_dir_and_assign_subvol (xlator_t *this, 
+				  const char *directory, const char *subvol);
+int assign_default_subvol (xlator_t *this, const char *default_xl);
+void verify_if_all_subvolumes_got_used (xlator_t *this);
+
+
+#endif /* __MAP_H__ */