Added all files

6 files changed, 5680 insertions, 0 deletions

diff --git a/xlators/storage/bdb/Makefile.am b/xlators/storage/bdb/Makefile.am
new file mode 100644
index 00000000000..d471a3f9243
--- /dev/null
+++ b/xlators/storage/bdb/Makefile.am
@@ -0,0 +1,3 @@
+SUBDIRS = src
+
+CLEANFILES = 
diff --git a/xlators/storage/bdb/src/Makefile.am b/xlators/storage/bdb/src/Makefile.am
new file mode 100644
index 00000000000..c0ab394bc58
--- /dev/null
+++ b/xlators/storage/bdb/src/Makefile.am
@@ -0,0 +1,18 @@
+
+xlator_LTLIBRARIES = bdb.la
+xlatordir = $(libdir)/glusterfs/$(PACKAGE_VERSION)/xlator/storage
+
+bdb_la_LDFLAGS = -module -avoidversion
+
+bdb_la_SOURCES = bctx.c bdb-ll.c bdb.c
+bdb_la_LIBADD = $(top_builddir)/libglusterfs/src/libglusterfs.la 
+
+noinst_HEADERS = bdb.h 
+
+AM_CFLAGS = -fPIC -D_FILE_OFFSET_BITS=64 -D__USE_FILE_OFFSET64 -D_GNU_SOURCE -D$(GF_HOST_OS) -Wall \
+	-I$(top_srcdir)/libglusterfs/src -shared -nostartfiles $(GF_CFLAGS)
+
+AM_LDFLAGS = -ldb
+
+CLEANFILES = 
+
diff --git a/xlators/storage/bdb/src/bctx.c b/xlators/storage/bdb/src/bctx.c
new file mode 100644
index 00000000000..2bfa3ea8762
--- /dev/null
+++ b/xlators/storage/bdb/src/bctx.c
@@ -0,0 +1,394 @@
+/*
+  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/>.
+*/
+
+#include <list.h>
+#include <bdb.h>
+#include <libgen.h> /* for dirname */
+
+static void
+__destroy_bctx (bctx_t *bctx)
+{
+	if (bctx->directory)
+		FREE (bctx->directory);
+  
+	if (bctx->db_path)
+		FREE (bctx->db_path);
+  
+	FREE (bctx);
+}
+
+static void
+__unhash_bctx (bctx_t *bctx)
+{
+	list_del_init (&bctx->b_hash);
+}
+
+static int32_t
+bctx_table_prune (bctx_table_t *table)
+{
+	int32_t ret = 0;
+	struct list_head purge = {0,};
+	struct list_head *next = NULL;
+	bctx_t *entry = NULL;
+	bctx_t *del = NULL, *tmp = NULL;
+  
+	if (!table)
+		return 0;
+  
+	INIT_LIST_HEAD (&purge);
+  
+	LOCK (&table->lock);
+	{
+		if ((table->lru_limit) &&
+		    (table->lru_size > table->lru_limit)) {
+			while (table->lru_size > table->lru_limit) {
+				next = table->b_lru.next;
+				entry = list_entry (next, bctx_t, list);
+	
+				list_move_tail (next, &table->purge);
+				__unhash_bctx (entry);
+	
+				table->lru_size--;
+				ret++;
+			}
+		}
+		list_move_tail (&purge, &table->purge);
+		list_del_init (&table->purge);
+	}
+	UNLOCK (&table->lock);
+  
+	{
+		list_for_each_entry_safe (del, tmp, &purge, list) {
+			list_del_init (&del->list);
+			if (del->dbp) {
+				ret = del->dbp->close (del->dbp, 0);
+				if (ret != 0) {
+					gf_log (table->this->name, GF_LOG_ERROR,
+						"failed to close db on path (%s): %s", 
+						del->directory, db_strerror (ret));
+				} else {
+					gf_log (table->this->name, GF_LOG_WARNING,
+						"close db for path %s; table->lru_count = %d", 
+						del->directory, table->lru_size);
+				}
+			}
+			__destroy_bctx (del);
+		}
+	}
+
+	return ret;
+}
+
+
+/* struct bdb_ctx related */
+static inline uint32_t
+bdb_key_hash (char *key, uint32_t hash_size)
+{
+	uint32_t hash = 0;
+  
+	hash = *key;
+  
+	if (hash) {
+		for (key += 1; *key != '\0'; key++) {
+			hash = (hash << 5) - hash + *key;
+		}
+	}
+  
+	return (hash + *key) % hash_size;
+}
+
+static void
+__hash_bctx (bctx_t *bctx)
+{
+	bctx_table_t *table = NULL;
+	char *key = NULL;
+
+	table = bctx->table;
+
+	MAKE_KEY_FROM_PATH (key, bctx->directory);
+	bctx->key_hash = bdb_key_hash (key, table->hash_size);
+
+	list_del_init (&bctx->b_hash);
+	list_add (&bctx->b_hash, &table->b_hash[bctx->key_hash]);
+}
+
+static inline bctx_t *
+__bctx_passivate (bctx_t *bctx)
+{
+	if (bctx->dbp) {
+		list_move_tail (&bctx->list, &(bctx->table->b_lru));
+		bctx->table->lru_size++;
+	} else {
+		list_move_tail (&bctx->list, &bctx->table->purge);
+		__unhash_bctx (bctx);
+	}
+	return bctx;
+}
+
+static inline bctx_t *
+__bctx_activate (bctx_t *bctx)
+{
+	list_move (&bctx->list, &bctx->table->active);
+	bctx->table->lru_size--;
+  
+	return bctx;
+}
+
+static bctx_t *
+__bdb_ctx_unref (bctx_t *bctx)
+{
+	assert (bctx->ref);
+  
+	--bctx->ref;
+  
+	if (!bctx->ref)
+		bctx = __bctx_passivate (bctx);
+  
+	return bctx;
+}
+
+
+bctx_t *
+bctx_unref (bctx_t *bctx)
+{
+	bctx_table_t *table = NULL;
+
+	if (!bctx && !bctx->table)
+		return NULL;
+  
+	table = bctx->table;
+
+	LOCK (&table->lock);    
+	{
+		bctx = __bdb_ctx_unref (bctx);
+	}
+	UNLOCK (&table->lock);
+  
+	bctx_table_prune (table);
+
+	return bctx;
+}
+
+/*
+ * NOTE: __bdb_ctx_ref() is called only after holding table->lock and bctx->lock, in that order
+ */
+static inline bctx_t *
+__bctx_ref (bctx_t *bctx)
+{
+	if (!bctx->ref)
+		__bctx_activate (bctx);
+
+	bctx->ref++;
+
+	return bctx;
+}
+
+bctx_t *
+bctx_ref (bctx_t *bctx)
+{
+	LOCK (&(bctx->table->lock));
+	{
+		__bctx_ref (bctx);
+	}
+	UNLOCK (&(bctx->table->lock));
+
+	return bctx;
+}
+
+
+#define BDB_THIS(table) (table->this)
+
+static inline bctx_t *
+__create_bctx (bctx_table_t *table,
+	       const char *path)
+{
+	bctx_t *bctx = NULL;
+	char *db_path = NULL;
+
+	bctx = CALLOC (1, sizeof (*bctx));
+	GF_VALIDATE_OR_GOTO ("bctx", bctx, out);
+
+	bctx->table = table;
+	bctx->directory = strdup (path);
+	GF_VALIDATE_OR_GOTO ("bctx", bctx->directory, out);
+
+	MAKE_REAL_PATH_TO_STORAGE_DB (db_path, BDB_THIS (table), path);
+
+	bctx->db_path = strdup (db_path);
+	GF_VALIDATE_OR_GOTO ("bctx", bctx->directory, out);
+
+	INIT_LIST_HEAD (&bctx->c_list);
+	INIT_LIST_HEAD (&bctx->list);
+	INIT_LIST_HEAD (&bctx->b_hash);
+
+	LOCK_INIT (&bctx->lock);
+
+	__hash_bctx (bctx);
+
+	list_add (&bctx->list, &table->b_lru);
+	table->lru_size++;
+
+out:
+	return bctx;
+}
+
+/* bctx_lookup - lookup bctx_t for the directory @directory. (see description of bctx_t in bdb.h)
+ *
+ * @table:     bctx_table_t for this instance of bdb.
+ * @directory: directory for which bctx_t is being looked up. 
+ */
+bctx_t *
+bctx_lookup (bctx_table_t *table, 
+	     const char *directory)
+{
+	char    *key = NULL;
+	uint32_t key_hash = 0;
+	bctx_t  *trav = NULL, *bctx = NULL, *tmp = NULL;
+	int32_t  need_break = 0;
+	
+	GF_VALIDATE_OR_GOTO ("bctx", table, out);
+	GF_VALIDATE_OR_GOTO ("bctx", directory, out);
+
+	MAKE_KEY_FROM_PATH (key, directory);
+	key_hash = bdb_key_hash (key, table->hash_size);
+
+	LOCK (&table->lock);
+	{
+		if (!list_empty (&table->b_hash[key_hash])) {
+			list_for_each_entry_safe (trav, tmp, &table->b_hash[key_hash], b_hash) {
+				LOCK(&trav->lock);
+				if (!strcmp(trav->directory, directory)) {
+					bctx = __bctx_ref (trav);
+					need_break = 1;
+				} 
+				UNLOCK(&trav->lock);
+				if (need_break)
+					break;
+			}
+		}
+    
+		if (!bctx) {
+			bctx = __create_bctx (table, directory);
+			bctx = __bctx_ref (bctx);
+		} 
+	}
+	UNLOCK (&table->lock);
+out:
+	return bctx;
+}
+
+
+bctx_t *
+bctx_parent (bctx_table_t *table,
+	     const char *path)
+{
+	char   *pathname = NULL, *directory = NULL;
+	bctx_t *bctx = NULL;
+
+	GF_VALIDATE_OR_GOTO ("bctx", table, out);
+	GF_VALIDATE_OR_GOTO ("bctx", path, out);
+  
+	pathname = strdup (path);
+	GF_VALIDATE_OR_GOTO ("bctx", pathname, out);
+	directory = dirname (pathname);
+
+	bctx = bctx_lookup (table, directory);
+	GF_VALIDATE_OR_GOTO ("bctx", bctx, out);
+  
+out:
+	if (pathname)
+		free (pathname);
+	return bctx;
+}
+
+inline int32_t
+bdb_db_rename (bctx_table_t *table, 
+	       const char *oldpath, 
+	       const char *newpath)
+{
+	DB_ENV *dbenv = NULL;
+	int32_t ret = -1;
+	
+	GF_VALIDATE_OR_GOTO ("bctx", table, out);
+	GF_VALIDATE_OR_GOTO ("bctx", oldpath, out);
+	GF_VALIDATE_OR_GOTO ("bctx", newpath, out);
+
+	dbenv = table->dbenv;
+	GF_VALIDATE_OR_GOTO ("bctx", dbenv, out);
+
+	LOCK (&table->lock);
+	{
+		ret = dbenv->dbrename (dbenv, NULL, oldpath, NULL, newpath, 0);
+    
+		if (ret != 0) {
+			gf_log ("bctx",
+				GF_LOG_ERROR,
+				"failed to rename %s to %s: %s", 
+				oldpath, newpath, db_strerror (ret));
+		} else {
+			gf_log ("bctx",
+				GF_LOG_DEBUG,
+				"successfully renamed %s to %s: %s",
+				oldpath, newpath, db_strerror (ret));
+		}
+	}
+	UNLOCK (&table->lock);
+
+out:
+	return ret;
+}
+
+bctx_t *
+bctx_rename (bctx_t *bctx, 
+	     const char *db_newpath)
+{
+	bctx_table_t *table = NULL;
+	int32_t ret = -1;
+
+	table = bctx->table;
+
+	LOCK (&table->lock);
+	{
+		__unhash_bctx (bctx);
+		list_del_init (&bctx->list);
+		if (bctx->dbp) {
+			ret = bctx->dbp->close (bctx->dbp, 0);
+			if (ret != 0) {
+				gf_log ("bdb-ll",
+					GF_LOG_ERROR,
+					"failed to close db for directory %s (%s)",
+					bctx->directory, db_strerror (ret));
+			}
+			bctx->dbp = NULL;
+		}
+	}
+	UNLOCK (&table->lock);
+  
+	ret = bdb_db_rename (table, bctx->db_path, db_newpath);
+	
+	if (ret != 0) {
+		gf_log ("bctx",
+			GF_LOG_ERROR,
+			"bdb_db_rename failed for directory %s",
+			bctx->directory);
+		bctx = NULL;
+	} 
+
+	return bctx;
+}
diff --git a/xlators/storage/bdb/src/bdb-ll.c b/xlators/storage/bdb/src/bdb-ll.c
new file mode 100644
index 00000000000..40e7d187759
--- /dev/null
+++ b/xlators/storage/bdb/src/bdb-ll.c
@@ -0,0 +1,1455 @@
+/*
+  Copyright (c) 2008, 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/>.
+*/
+
+#include <libgen.h>
+#include "bdb.h"
+#include <list.h>
+/* 
+ * implement the procedures to interact with bdb */
+
+/****************************************************************
+ *
+ * General wrappers and utility procedures for bdb xlator
+ *
+ ****************************************************************/
+#define BDB_LL_PAGE_SIZE_DEFAULT    4096
+#define BDB_LL_PAGE_SIZE_MIN    4096
+#define BDB_LL_PAGE_SIZE_MAX    65536
+
+ino_t
+bdb_inode_transform (ino_t parent,
+                     bctx_t *bctx)
+{
+	struct bdb_private *private = NULL;
+	ino_t               ino = -1;
+	
+	GF_VALIDATE_OR_GOTO ("bdb-ll", bctx, out);
+
+	private = bctx->table->this->private;
+
+	LOCK (&private->ino_lock);
+	ino = ++private->next_ino;
+	UNLOCK (&private->ino_lock);
+out:
+	return ino;
+}
+
+
+/***********************************************************
+ *
+ *  bdb storage database utilities
+ *
+ **********************************************************/
+
+/*
+ * bdb_db_open - opens a storage db.
+ *
+ * @ctx: context specific to the directory for which we are supposed to open db
+ *
+ * see, if we have empty slots to open a db.
+ *      if (no-empty-slots), then prune open dbs and close as many as possible
+ *      if (empty-slot-available), tika muchkonDu db open maaDu
+ *
+ * NOTE: illi baro munche lock hiDkobEku
+ */
+static DB *
+bdb_db_open (bctx_t *bctx)
+{
+	DB *storage_dbp = NULL;
+	int32_t op_ret = -1;
+	bctx_table_t *table = NULL;
+	
+	GF_VALIDATE_OR_GOTO ("bdb-ll", bctx, out);
+
+	table = bctx->table;
+	GF_VALIDATE_OR_GOTO ("bdb-ll", table, out);
+
+	/* we have to do the following, we can't deny someone of db_open ;) */
+	op_ret = db_create (&storage_dbp, table->dbenv, 0);
+	if (op_ret != 0) {
+		gf_log ("bdb-ll", GF_LOG_ERROR,
+			"failed to do db_create for directory %s (%s)",
+			bctx->directory, db_strerror (op_ret));
+		storage_dbp = NULL;
+		goto out;
+	} 
+
+	if (table->page_size) {
+		op_ret = storage_dbp->set_pagesize (storage_dbp, 
+						    table->page_size);
+		if (op_ret != 0) {
+			gf_log ("bdb-ll", GF_LOG_ERROR, 
+				"failed to set the page_size (%"PRIu64") for directory %s (%s)", 
+				table->page_size, bctx->directory, db_strerror (op_ret));
+		} else {
+			gf_log ("bdb-ll", GF_LOG_DEBUG,
+				"page-size (%"PRIu64") set on DB", 
+				table->page_size);
+		}
+	}
+     
+	op_ret = storage_dbp->open (storage_dbp,
+				    NULL,
+				    bctx->db_path,
+				    NULL,
+				    table->access_mode,
+				    table->dbflags,
+				    0);
+	if (op_ret != 0 ) {
+		gf_log ("bdb-ll",
+			GF_LOG_ERROR,
+			"failed to open storage-db for directory %s (%s)", 
+			bctx->db_path, db_strerror (op_ret));
+		storage_dbp = NULL;
+	} 
+
+out:
+	return storage_dbp;
+}
+
+
+
+int32_t
+bdb_cursor_close (bctx_t *bctx,
+		  DBC *cursorp)
+{
+	int32_t ret = -1;
+	
+	GF_VALIDATE_OR_GOTO ("bdb-ll", bctx, out);
+	GF_VALIDATE_OR_GOTO ("bdb-ll", cursorp, out);
+
+	LOCK (&bctx->lock);
+	{
+#ifdef HAVE_BDB_CURSOR_GET
+		ret = cursorp->close (cursorp);
+#else
+		ret = cursorp->c_close (cursorp);
+#endif
+		if ((ret != 0)) {
+			gf_log ("bdb-ll",
+				GF_LOG_ERROR,
+				"failed to close db cursor for directory %s (%s)",
+				bctx->directory, db_strerror (ret));
+		}
+	}
+	UNLOCK (&bctx->lock);
+
+out: 
+	return ret;
+}
+
+
+int32_t
+bdb_cursor_open (bctx_t *bctx,
+		 DBC **cursorpp)
+{
+	int32_t ret = -1;
+	
+	GF_VALIDATE_OR_GOTO ("bdb-ll", bctx, out);
+	GF_VALIDATE_OR_GOTO ("bdb-ll", cursorpp, out);
+
+	LOCK (&bctx->lock);
+	{
+		if (bctx->dbp) {
+			/* do nothing, just continue */
+			ret = 0;
+		} else {
+			bctx->dbp = bdb_db_open (bctx);
+			if (!bctx->dbp) {
+				gf_log ("bdb-ll",
+					GF_LOG_ERROR,
+					"failed to open storage db for %s", 
+					bctx->directory);
+				ret = -1;
+			} else {
+				ret = 0;
+			}
+		}
+  
+		if (ret == 0) {
+			/* all set, lets open cursor */
+			ret = bctx->dbp->cursor (bctx->dbp, NULL, cursorpp, 0);
+			if (ret != 0) {
+				gf_log ("bdb-ll",
+					GF_LOG_ERROR,
+					"failed to create a cursor for %s (%s)", 
+					bctx->directory, db_strerror (ret));
+			}
+		}
+	}
+	UNLOCK (&bctx->lock);
+
+out:
+	return ret;
+}
+
+
+/* cache related */
+static bdb_cache_t *
+bdb_cache_lookup (bctx_t *bctx,
+                  char *path)
+{
+	bdb_cache_t *bcache = NULL; 
+	bdb_cache_t *trav   = NULL;
+	char        *key    = NULL;
+	
+	GF_VALIDATE_OR_GOTO ("bdb-ll", bctx, out);
+	GF_VALIDATE_OR_GOTO ("bdb-ll", path, out);
+
+	MAKE_KEY_FROM_PATH (key, path);
+
+	LOCK (&bctx->lock);
+	{
+		list_for_each_entry (trav, &bctx->c_list, c_list) {
+			if (!strcmp (trav->key, key)){
+				bcache = trav;
+				break;
+			}
+		}
+	}
+	UNLOCK (&bctx->lock);
+
+out:
+	return bcache;
+}
+
+static int32_t
+bdb_cache_insert (bctx_t *bctx, 
+		  DBT *key, 
+		  DBT *data)
+{
+	bdb_cache_t *bcache = NULL;
+	int32_t ret = -1;
+
+	GF_VALIDATE_OR_GOTO ("bdb-ll", bctx, out);
+	GF_VALIDATE_OR_GOTO ("bdb-ll", key, out);
+	GF_VALIDATE_OR_GOTO ("bdb-ll", data, out);
+
+	LOCK (&bctx->lock);
+	{
+		if (bctx->c_count > 5) {
+			/* most of the times, we enter here */
+			/* FIXME: ugly, not supposed to disect any of the
+			 * 'struct list_head' directly */
+			if (!list_empty (&bctx->c_list)) {
+				bcache = list_entry (bctx->c_list.prev, bdb_cache_t, c_list);
+				list_del_init (&bcache->c_list);
+			}
+			if (bcache->key) {
+				free (bcache->key);
+				bcache->key = strdup ((char *)key->data);
+				GF_VALIDATE_OR_GOTO ("bdb-ll", bcache->key, unlock);
+			} else {
+				/* should never come here */
+				gf_log ("bdb-ll",
+					GF_LOG_CRITICAL,
+					"bcache->key (null)");
+			} /* if(bcache->key)...else */
+			if (bcache->data) {
+				free (bcache->data);
+				bcache->data = memdup (data->data, data->size);
+				GF_VALIDATE_OR_GOTO ("bdb-ll", bcache->data, unlock);
+				bcache->size = data->size;
+			} else {
+				/* should never come here */
+				gf_log ("bdb-ll",
+					GF_LOG_CRITICAL,
+					"bcache->data (null)");
+			} /* if(bcache->data)...else */
+			list_add (&bcache->c_list, &bctx->c_list);
+			ret = 0;
+		} else {
+			/* we will be entering here very rarely */
+			bcache = CALLOC (1, sizeof (*bcache));    
+			GF_VALIDATE_OR_GOTO ("bdb-ll", bcache, unlock);
+			bcache->key = strdup ((char *)(key->data));
+			GF_VALIDATE_OR_GOTO ("bdb-ll", bcache->key, unlock);
+			bcache->data = memdup (data->data, data->size);
+			GF_VALIDATE_OR_GOTO ("bdb-ll", bcache->data, unlock);
+			bcache->size = data->size;
+			list_add (&bcache->c_list, &bctx->c_list);
+			bctx->c_count++;
+			ret = 0;
+		} /* if(private->c_count < 5)...else */
+	}
+unlock:
+	UNLOCK (&bctx->lock);
+out:
+	return ret;
+}
+
+static int32_t
+bdb_cache_delete (bctx_t *bctx,
+		  char *key)
+{
+	bdb_cache_t *bcache = NULL; 
+	bdb_cache_t *trav   = NULL;
+	
+	GF_VALIDATE_OR_GOTO ("bdb-ll", bctx, out);
+	GF_VALIDATE_OR_GOTO ("bdb-ll", key, out);
+
+	LOCK (&bctx->lock);
+	{
+		list_for_each_entry (trav, &bctx->c_list, c_list) {
+			if (!strcmp (trav->key, key)){
+				bctx->c_count--;
+				bcache = trav;
+				break;
+			}
+		}
+  
+		if (bcache) {
+			list_del_init (&bcache->c_list);
+			free (bcache->key);
+			free (bcache->data);
+			free (bcache);
+		}
+	}
+	UNLOCK (&bctx->lock);
+
+out:
+	return 0;
+}
+
+void *
+bdb_db_stat (bctx_t *bctx, 
+	     DB_TXN *txnid,
+	     uint32_t flags)
+{
+	DB     *storage = NULL;
+	void   *stat    = NULL;
+	int32_t ret     = -1;
+
+	LOCK (&bctx->lock);
+	{
+		if (bctx->dbp == NULL) {
+			bctx->dbp = bdb_db_open (bctx);
+			storage = bctx->dbp;
+		} else {
+			/* we are just fine, lets continue */
+			storage = bctx->dbp;
+		} /* if(bctx->dbp==NULL)...else */
+	}
+	UNLOCK (&bctx->lock);
+
+	GF_VALIDATE_OR_GOTO ("bdb-ll", storage, out);
+
+	ret = storage->stat (storage, txnid, &stat, flags);
+    
+	if (ret != 0) {
+		gf_log ("bdb-ll",
+			GF_LOG_ERROR,
+			"failed to do DB->stat() on db file %s: %s", 
+			bctx->db_path, db_strerror (ret));
+	} else {
+		gf_log ("bdb-ll",
+			GF_LOG_DEBUG,
+			"successfully called DB->stat() on db file %s", 
+			bctx->db_path);
+	}
+out:
+	return stat;
+  
+}
+
+/* bdb_storage_get - retrieve a key/value pair corresponding to @path from the corresponding
+ *                   db file.
+ *
+ * @bctx: bctx_t * corresponding to the parent directory of @path. (should always be a valid
+ *        bctx).  bdb_storage_get should never be called if @bctx = NULL.
+ * @txnid: NULL if bdb_storage_get is not embedded in an explicit transaction or a valid
+ *         DB_TXN *, when embedded in an explicit transaction.        
+ * @path: path of the file to read from (translated to a database key using MAKE_KEY_FROM_PATH)
+ * @buf: char ** - pointer to a pointer to char. a read buffer is created in this procedure
+ *       and pointer to the buffer is passed through @buf to the caller.
+ * @size: size of the file content to be read.
+ * @offset: offset from which the file content to be read.
+ *
+ * NOTE: bdb_storage_get tries to open DB, if @bctx->dbp == NULL (@bctx->dbp == NULL, 
+ *      nobody has opened DB till now or DB was closed by bdb_table_prune()).
+ *
+ * NOTE: if private->cache is set (bdb xlator's internal caching enabled), then bdb_storage_get
+ *      first looks up the cache for key/value pair. if bdb_lookup_cache fails, then only 
+ *      DB->get() is called. also,  inserts a newly read key/value pair to cache through
+ *      bdb_insert_to_cache.
+ *
+ * return: 'number of bytes read' on success or -1 on error.
+ *
+ * also see: bdb_lookup_cache, bdb_insert_to_cache for details about bdb xlator's internal cache.
+ */
+int32_t
+bdb_db_get (bctx_t *bctx,
+	    DB_TXN *txnid,
+	    const char *path,
+	    char **buf,
+	    size_t size,
+	    off_t offset)
+{
+	DB          *storage    = NULL;
+	DBT          key        = {0,};
+	DBT          value      = {0,};
+	int32_t      ret        = -1;
+	char        *key_string = NULL;
+	bdb_cache_t *bcache     = NULL;
+	int32_t      db_flags   = 0;
+	uint8_t      need_break = 0;
+	int32_t      retries    = 1;
+	
+	GF_VALIDATE_OR_GOTO ("bdb-ll", bctx, out);
+	GF_VALIDATE_OR_GOTO ("bdb-ll", path, out);
+
+	MAKE_KEY_FROM_PATH (key_string, path);
+	
+	if (bctx->cache && 
+	    ((bcache = bdb_cache_lookup (bctx, key_string)) != NULL)) {
+		if (buf) {
+			*buf = CALLOC (1, bcache->size);
+			GF_VALIDATE_OR_GOTO ("bdb-ll", buf, out);
+			memcpy (*buf, (bcache->data + offset), bcache->size);
+		}
+		ret = bcache->size;
+	} else {
+		LOCK (&bctx->lock);
+		{
+			if (bctx->dbp == NULL) {
+				bctx->dbp = bdb_db_open (bctx);
+				storage = bctx->dbp;
+			} else {
+				/* we are just fine, lets continue */
+				storage = bctx->dbp;
+			} /* if(bctx->dbp==NULL)...else */
+		}
+		UNLOCK (&bctx->lock);
+		
+		GF_VALIDATE_OR_GOTO ("bdb-ll", storage, out);
+
+		key.data = (char *)key_string;
+		key.size = strlen (key_string);
+		key.flags = DB_DBT_USERMEM;
+      
+		if (bctx->cache){
+			/* we are called to return the size of the file */
+			value.flags = DB_DBT_MALLOC;
+		} else {
+			if (size) {
+				value.flags = DB_DBT_MALLOC | DB_DBT_PARTIAL;
+			} else {
+				value.flags = DB_DBT_MALLOC;
+			}
+			value.dlen = size;
+			value.doff = offset;
+		}
+      
+		do {
+			/* TODO: we prefer to give our own buffer to value.data
+			 * and ask bdb to fill in it */
+			ret = storage->get (storage, txnid, &key, &value, db_flags);
+        
+			if (ret == DB_NOTFOUND) {
+				gf_log ("bdb-ll",
+					GF_LOG_DEBUG,
+					"failed to do DB->get() for key: %s."
+					" key not found in storage DB", key_string);
+				ret = -1;
+				need_break = 1;
+			} else if (ret == DB_LOCK_DEADLOCK) {
+				retries++;
+				gf_log ("bdb-ll",
+					GF_LOG_ERROR,
+					"deadlock detected in DB->put. retrying DB->put (%d)", 
+					retries);
+			}else if (ret == 0) {
+				/* successfully read data, lets set everything in place
+				 * and return */
+				if (buf) {
+					*buf = CALLOC (1, value.size);
+					ERR_ABORT (*buf);
+					memcpy (*buf, value.data, value.size);
+				}
+				ret = value.size;
+				if (bctx->cache)
+					bdb_cache_insert (bctx, &key, &value);
+				free (value.data);
+				need_break = 1;
+			} else {
+				gf_log ("bdb-ll",
+					GF_LOG_ERROR,
+					"failed to do DB->get() for key %s: %s", 
+					key_string, db_strerror (ret));
+				ret = -1;
+				need_break = 1;
+			}
+		} while (!need_break);
+	}
+out:  
+	return ret;
+}/* bdb_db_get */
+
+/* bdb_storage_put - insert a key/value specified to the corresponding DB.
+ *
+ * @bctx: bctx_t * corresponding to the parent directory of @path. 
+ *        (should always be a valid bctx). bdb_storage_put should never be called if @bctx = NULL.
+ * @txnid: NULL if bdb_storage_put is not embedded in an explicit transaction or a valid
+ *         DB_TXN *, when embedded in an explicit transaction. 
+ * @key_string: key of the database entry.
+ * @buf: pointer to the buffer data to be written as data for @key_string.
+ * @size: size of @buf.
+ * @offset: offset in the key's data to be modified with provided data.
+ * @flags: valid flags are BDB_TRUNCATE_RECORD (to reduce the data of @key_string to 0 size).
+ *
+ * NOTE: bdb_storage_put tries to open DB, if @bctx->dbp == NULL (@bctx->dbp == NULL, 
+ *      nobody has opened DB till now or DB was closed by bdb_table_prune()).
+ *
+ * NOTE: bdb_storage_put deletes the key/value from bdb xlator's internal cache.
+ *
+ * return: 0 on success or -1 on error.
+ *
+ * also see: bdb_cache_delete for details on how a cached key/value pair is removed.
+ */
+int32_t
+bdb_db_put (bctx_t *bctx,
+	    DB_TXN *txnid,
+	    const char *key_string,
+	    const char *buf,
+	    size_t size,
+	    off_t offset,
+	    int32_t flags)
+{
+	DB     *storage = NULL;
+	DBT     key = {0,}, value = {0,};
+	int32_t ret = -1;
+	int32_t db_flags = DB_AUTO_COMMIT;
+	uint8_t need_break = 0;
+	int32_t retries = 1;
+
+	LOCK (&bctx->lock);
+	{
+		if (bctx->dbp == NULL) {
+			bctx->dbp = bdb_db_open (bctx);
+			storage = bctx->dbp;
+		} else {
+			/* we are just fine, lets continue */
+			storage = bctx->dbp;
+		}
+	}
+	UNLOCK (&bctx->lock);
+	
+	GF_VALIDATE_OR_GOTO ("bdb-ll", storage, out);
+
+	if (bctx->cache) {
+		ret = bdb_cache_delete (bctx, (char *)key_string);
+		GF_VALIDATE_OR_GOTO ("bdb-ll", (ret == 0), out);
+	}
+
+	key.data = (void *)key_string;
+	key.size = strlen (key_string);
+    
+	/* NOTE: bdb lets us expand the file, suppose value.size > value.len, then value.len bytes
+	 *      from value.doff offset and value.size bytes will be written from value.doff and 
+	 *      data from value.doff + value.dlen will be pushed value.doff + value.size
+	 */
+	value.data = (void *)buf;
+
+	if (flags & BDB_TRUNCATE_RECORD) {
+		value.size = size;
+		value.doff = 0;
+		value.dlen = offset;
+	} else {
+		value.size = size;
+		value.dlen = size;
+		value.doff = offset;
+	}
+	value.flags = DB_DBT_PARTIAL;
+	if (buf == NULL && size == 0) 
+		/* truncate called us */
+		value.flags = 0;
+    
+	do {
+		ret = storage->put (storage, txnid, &key, &value, db_flags);
+		if (ret == DB_LOCK_DEADLOCK) {
+			retries++;
+			gf_log ("bdb-ll",
+				GF_LOG_ERROR,
+				"deadlock detected in DB->put. retrying DB->put (%d)", 
+				retries);
+		} else if (ret) {
+			/* write failed */
+			gf_log ("bdb-ll",
+				GF_LOG_ERROR,
+				"failed to do DB->put() for key %s: %s", 
+				key_string, db_strerror (ret));
+			need_break = 1;
+		} else {
+			/* successfully wrote */
+			ret = 0;
+			need_break = 1;
+		}
+	} while (!need_break);
+out:
+	return ret;
+}/* bdb_db_put */
+
+
+/* bdb_storage_del - delete a key/value pair corresponding to @path from corresponding db file.
+ *
+ * @bctx: bctx_t * corresponding to the parent directory of @path. 
+ *       (should always be a valid bctx). bdb_storage_del should never be called
+ *       if @bctx = NULL.
+ * @txnid: NULL if bdb_storage_del is not embedded in an explicit transaction or a
+ *         valid DB_TXN *, when embedded in an explicit transaction. 
+ * @path: path to the file, whose key/value pair has to be deleted.
+ *
+ * NOTE: bdb_storage_del tries to open DB, if @bctx->dbp == NULL (@bctx->dbp == NULL, 
+ *      nobody has opened DB till now or DB was closed by bdb_table_prune()).
+ *
+ * return: 0 on success or -1 on error.
+ */
+int32_t
+bdb_db_del (bctx_t *bctx,
+	    DB_TXN *txnid,
+	    const char *path)
+{
+	DB     *storage    = NULL;
+	DBT     key        = {0,};
+	char   *key_string = NULL;
+	int32_t ret        = -1;
+	int32_t db_flags   = 0;
+	uint8_t need_break = 0;
+	int32_t retries    = 1;
+
+	MAKE_KEY_FROM_PATH (key_string, path);
+
+	LOCK (&bctx->lock);
+	{
+		if (bctx->dbp == NULL) {
+			bctx->dbp = bdb_db_open (bctx);
+			storage = bctx->dbp;
+		} else {
+			/* we are just fine, lets continue */
+			storage = bctx->dbp;
+		}
+	}
+	UNLOCK (&bctx->lock);  
+	
+	GF_VALIDATE_OR_GOTO ("bdb-ll", storage, out);
+
+	ret = bdb_cache_delete (bctx, key_string);
+	GF_VALIDATE_OR_GOTO ("bdb-ll", (ret == 0), out);
+
+	key.data = key_string;
+	key.size = strlen (key_string);
+	key.flags = DB_DBT_USERMEM;
+    
+	do {
+		ret = storage->del (storage, txnid, &key, db_flags);
+      
+		if (ret == DB_NOTFOUND) {
+			gf_log ("bdb-ll",
+				GF_LOG_DEBUG,
+				"failed to delete %s from storage db, doesn't exist in storage DB", 
+				path);
+			need_break = 1;
+		} else if (ret == DB_LOCK_DEADLOCK) {
+			retries++;
+			gf_log ("bdb-ll",
+				GF_LOG_ERROR,
+				"deadlock detected in DB->put. retrying DB->put (%d)", 
+				retries);
+		}else if (ret == 0) {
+			/* successfully deleted the entry */
+			gf_log ("bdb-ll",
+				GF_LOG_DEBUG,
+				"deleted %s from storage db", path);
+			ret = 0;
+			need_break = 1;
+		} else {
+			gf_log ("bdb-ll",
+				GF_LOG_ERROR,
+				"failed to delete %s from storage db: %s", 
+				path, db_strerror (ret));
+			ret = -1;
+			need_break = 1;    
+		}
+	} while (!need_break);
+out:
+	return ret;
+}
+
+/* NOTE: bdb version compatibility wrapper */
+int32_t
+bdb_cursor_get (DBC *cursorp,
+                DBT *key,
+                DBT *value,
+                int32_t flags)
+{
+	int32_t ret = -1;
+	
+	GF_VALIDATE_OR_GOTO ("bdb-ll", cursorp, out);
+
+#ifdef HAVE_BDB_CURSOR_GET
+	ret = cursorp->get (cursorp, key, value, flags);
+#else
+	ret = cursorp->c_get (cursorp, key, value, flags);
+#endif
+	if ((ret != 0)  && (ret != DB_NOTFOUND)) {
+		gf_log ("bdb-ll",
+			GF_LOG_ERROR,
+			"failed to CURSOR->get() for key %s (%s)",
+			(char *)key->data, db_strerror (ret));
+	}
+
+out:
+	return ret;
+}/* bdb_cursor_get */
+
+
+int32_t
+bdb_dirent_size (DBT *key)
+{
+	return ALIGN (24 /* FIX MEEEE!!! */ + key->size);
+}
+
+
+/* bdb_extract_bfd - translate a fd_t to a bfd (either a 'struct bdb_bfd' or 'struct bdb_dir')
+ *
+ * @fd->ctx is with bdb specific file handle during a successful bdb_open (also bdb_create)
+ *  or bdb_opendir.
+ *
+ * return: 'struct bdb_bfd *' or 'struct bdb_dir *' on success, or NULL on failure.
+ */
+inline void *
+bdb_extract_bfd (fd_t *fd,
+                 xlator_t *this)
+{
+	uint64_t tmp_bfd = 0;
+	void    *bfd     = NULL;
+ 	
+	GF_VALIDATE_OR_GOTO ("bdb-ll", fd, out);
+	GF_VALIDATE_OR_GOTO ("bdb-ll", this, out);
+
+	fd_ctx_get (fd, this, &tmp_bfd);
+	bfd = (void *)(long)bfd;
+
+out:
+	return bfd;
+}
+
+/* bdb_dbenv_init - initialize DB_ENV
+ *
+ *  initialization includes:
+ *   1. opening DB_ENV (db_env_create(), DB_ENV->open()). 
+ *      NOTE: see private->envflags for flags used.
+ *   2. DB_ENV->set_lg_dir - set log directory to be used for storing log files 
+ *     (log files are the files in which transaction logs are written by db).
+ *   3. DB_ENV->set_flags (DB_LOG_AUTOREMOVE) - set DB_ENV to automatically clear
+ *      the unwanted log files (flushed at each checkpoint).
+ *   4. DB_ENV->set_errfile - set errfile to be used by db to report detailed error logs. 
+ *     used only for debbuging purpose.
+ *
+ * return: returns a valid DB_ENV * on success or NULL on error.
+ *
+ */
+static DB_ENV *
+bdb_dbenv_init (xlator_t *this,
+		char *directory)
+{
+	/* Create a DB environment */
+	DB_ENV        *dbenv       = NULL;
+	int32_t        ret         = 0;
+	bdb_private_t *private     = NULL;
+	int32_t        fatal_flags = 0;
+	
+	VALIDATE_OR_GOTO (this, out);
+	VALIDATE_OR_GOTO (directory, out);
+
+	private = this->private;
+	VALIDATE_OR_GOTO (private, out);
+
+	ret = db_env_create (&dbenv, 0);
+	VALIDATE_OR_GOTO ((ret == 0), out);
+	
+	/* NOTE: set_errpfx returns 'void' */
+	dbenv->set_errpfx(dbenv, this->name);
+	
+	ret = dbenv->set_lk_detect (dbenv, DB_LOCK_DEFAULT);
+	VALIDATE_OR_GOTO ((ret == 0), out);
+
+	ret = dbenv->open(dbenv, directory, 
+			  private->envflags, 
+			  S_IRUSR | S_IWUSR);
+	if ((ret != 0) && (ret != DB_RUNRECOVERY)) {
+		gf_log (this->name, 
+			GF_LOG_CRITICAL, 
+			"failed to open DB environment (%s)", 
+			db_strerror (ret));
+		dbenv = NULL;
+		goto out;
+	} else if (ret == DB_RUNRECOVERY) {
+		fatal_flags = ((private->envflags & (~DB_RECOVER)) | DB_RECOVER_FATAL);
+		ret = dbenv->open(dbenv, directory, 
+				  fatal_flags, 
+				  S_IRUSR | S_IWUSR);
+		if (ret != 0) {
+			gf_log (this->name, 
+				GF_LOG_ERROR,
+				"failed to open DB environment (%s) with DB_REOVER_FATAL",
+				db_strerror (ret));
+			dbenv = NULL;
+			goto out;
+		} else {
+			gf_log (this->name, 
+				GF_LOG_WARNING,
+				"opened DB environment after DB_RECOVER_FATAL: %s", 
+				db_strerror (ret));
+		}
+	} else {
+		gf_log (this->name, 
+			GF_LOG_DEBUG,
+			"DB environment successfull opened: %s", 
+			db_strerror (ret));
+	}
+
+        
+
+#if (DB_VERSION_MAJOR == 4 &&			\
+     DB_VERSION_MINOR == 7)
+	if (private->log_auto_remove) {
+		ret = dbenv->log_set_config (dbenv, DB_LOG_AUTO_REMOVE, 1);
+	} else {
+		ret = dbenv->log_set_config (dbenv, DB_LOG_AUTO_REMOVE, 0);
+	}
+#else
+	if (private->log_auto_remove) {
+		ret = dbenv->set_flags (dbenv, DB_LOG_AUTOREMOVE, 1);
+	} else {
+		ret = dbenv->set_flags (dbenv, DB_LOG_AUTOREMOVE, 0);
+	}         
+#endif
+	if (ret != 0) {
+		gf_log ("bctx",
+			GF_LOG_ERROR,
+			"failed to set DB_LOG_AUTOREMOVE on dbenv: %s", db_strerror (ret));
+	} else {
+		gf_log ("bctx",
+			GF_LOG_DEBUG,
+			"DB_LOG_AUTOREMOVE set on dbenv");
+	}
+
+	if (private->transaction) {
+		ret = dbenv->set_flags(dbenv, DB_AUTO_COMMIT, 1);
+          
+		if (ret != 0) {
+			gf_log ("bctx",
+				GF_LOG_ERROR,
+				"failed to set DB_AUTO_COMMIT on dbenv: %s", 
+				db_strerror (ret));
+		} else {
+			gf_log ("bctx",
+				GF_LOG_DEBUG,
+				"DB_AUTO_COMMIT set on dbenv");
+		}
+          
+		if (private->txn_timeout) {
+			ret = dbenv->set_timeout (dbenv, 
+						  private->txn_timeout, 
+						  DB_SET_TXN_TIMEOUT);
+			if (ret != 0) {
+				gf_log ("bctx",
+					GF_LOG_ERROR,
+					"failed to set TXN_TIMEOUT to %d milliseconds "
+					"on dbenv: %s", 					
+					private->txn_timeout, db_strerror (ret));
+			} else {
+				gf_log ("bctx",
+					GF_LOG_DEBUG,
+					"TXN_TIMEOUT set to %d milliseconds", 
+					private->txn_timeout);
+			}
+		}
+
+		if (private->lock_timeout) {
+			ret = dbenv->set_timeout(dbenv, 
+						 private->txn_timeout, 
+						 DB_SET_LOCK_TIMEOUT);
+            
+			if (ret != 0) {
+				gf_log ("bctx",
+					GF_LOG_ERROR,
+					"failed to set LOCK_TIMEOUT to %d milliseconds "
+					"on dbenv: %s", 
+					private->lock_timeout, db_strerror (ret));
+			} else {
+				gf_log ("bctx",
+					GF_LOG_DEBUG,
+					"LOCK_TIMEOUT set to %d milliseconds", 
+					private->lock_timeout);
+			}
+		}
+
+		ret = dbenv->set_lg_dir (dbenv, private->logdir);
+		
+		if (ret != 0) {
+			gf_log ("bctx",
+				GF_LOG_ERROR,
+				"failed to set log directory for dbenv: %s", db_strerror (ret));
+		} else {
+			gf_log ("bctx",
+				GF_LOG_DEBUG,
+				"set dbenv log dir to %s", private->logdir);
+		}
+		
+	}
+        
+	if (private->errfile) {
+		private->errfp = fopen (private->errfile, "a+");
+		if (private->errfp) {
+			dbenv->set_errfile (dbenv, private->errfp);
+		} else {
+			gf_log ("bctx",
+				GF_LOG_ERROR,
+				"failed to open errfile: %s", strerror (errno));
+		}
+	}
+
+out:
+	return dbenv;
+}
+
+#define BDB_ENV(this) ((((struct bdb_private *)this->private)->b_table)->dbenv)
+
+/* bdb_checkpoint - during transactional usage, db does not directly write the data to db
+ *                  files, instead db writes a 'log' (similar to a journal entry) into a
+ *                  log file. db normally clears the log files during opening of an
+ *                  environment. since we expect a filesystem server to run for a pretty
+ *                  long duration and flushing 'log's during dbenv->open would prove very 
+ *                  costly, if we accumulate the log entries for one complete run of 
+ *                  glusterfs server. to flush the logs frequently, db provides a mechanism
+ *                  called 'checkpointing'. when we do a checkpoint, db flushes the logs to
+ *                  disk (writes changes to db files) and we can also clear the accumulated 
+ *                  log files after checkpointing. NOTE: removing unwanted log files is not
+ *                  part of dbenv->txn_checkpoint() call. 
+ *
+ * @data: xlator_t of the current instance of bdb xlator.
+ *
+ *  bdb_checkpoint is called in a different thread from the main glusterfs thread. bdb 
+ *  xlator creates the checkpoint thread after successfully opening the db environment. 
+ *  NOTE: bdb_checkpoint thread shares the DB_ENV handle with the filesystem thread.
+ *
+ *  db environment checkpointing frequency is controlled by 
+ *  'option checkpoint-timeout <time-in-seconds>' in volfile.
+ *
+ * NOTE: checkpointing thread is started only if 'option transaction on' specified in
+ *      volfile. checkpointing is not valid for non-transactional environments.
+ *
+ */
+static void *
+bdb_checkpoint (void *data)
+{
+	xlator_t *this = NULL;
+	struct bdb_private *private = NULL;
+	DB_ENV *dbenv = NULL;
+	int32_t ret = 0;
+	uint32_t active = 0;
+
+	this = (xlator_t *) data;
+	dbenv = BDB_ENV(this);
+	private = this->private;
+
+	for (;;sleep (private->checkpoint_timeout)) {
+		LOCK (&private->active_lock);
+		active = private->active;
+		UNLOCK (&private->active_lock);
+ 
+		if (active) {
+			ret = dbenv->txn_checkpoint (dbenv, 1024, 0, 0);
+			if (ret) {
+				gf_log ("bctx",
+					GF_LOG_ERROR,
+					"failed to checkpoint environment: %s", db_strerror (ret));
+			} else {
+				gf_log ("bctx",
+					GF_LOG_DEBUG,
+					"checkpointing successful");
+			} 
+		} else {
+			ret = dbenv->txn_checkpoint (dbenv, 1024, 0, 0);
+			if (ret) {
+				gf_log ("bctx",
+					GF_LOG_ERROR,
+					"failed to do final checkpoint environment: %s", 
+					db_strerror (ret));
+			} else {
+				gf_log ("bctx",
+					GF_LOG_DEBUG,
+					"final checkpointing successful");
+			}
+			break;
+		}
+	}
+
+	return NULL;
+}
+
+static inline void
+BDB_CACHE_INIT (xlator_t *this,
+		dict_t *options, 
+		struct bdb_private *private)
+{
+	/* cache is always on */
+	private->cache = ON;
+}
+
+static inline void
+BDB_LOG_REMOVE_INIT(xlator_t *this,
+		    dict_t *options,
+		    struct bdb_private *private)
+{
+	private->log_auto_remove = 1;
+	gf_log (this->name,
+		GF_LOG_DEBUG,
+		"DB_ENV will use DB_LOG_AUTO_REMOVE");
+}
+
+static inline void
+BDB_ERRFILE_INIT (xlator_t *this,
+		  dict_t *options,
+		  struct bdb_private *private)
+{
+	data_t *errfile = NULL;
+
+	errfile = dict_get (options, "errfile");
+	if (errfile) {
+		private->errfile = strdup (errfile->data);
+		gf_log (this->name,
+			GF_LOG_DEBUG,
+			"using errfile: %s", private->errfile);
+	} 
+}
+
+static inline void
+BDB_TABLE_INIT (xlator_t *this,
+		dict_t *options,
+		struct bdb_private *private)
+{
+	bctx_table_t *table = NULL;
+	int32_t        idx                = 0;
+  
+	data_t        *lru_limit          = NULL;
+	data_t        *page_size          = NULL;
+	
+	table = CALLOC (1, sizeof (*table));
+	if (table) {
+		INIT_LIST_HEAD(&(table->b_lru));
+		INIT_LIST_HEAD(&(table->active));
+		INIT_LIST_HEAD(&(table->purge));
+
+		LOCK_INIT (&table->lock);
+		LOCK_INIT (&table->checkpoint_lock);
+      
+		table->transaction = private->transaction;
+		table->access_mode = private->access_mode;
+		table->dbflags = private->dbflags;
+		table->this    = this;
+
+		{
+			lru_limit = dict_get (options, "lru-limit");
+        
+			/* TODO: set max lockers and max txns to accomodate 
+			 * for more than lru_limit */
+			if (lru_limit) {
+				table->lru_limit = strtol (lru_limit->data, NULL, 0);
+				gf_log ("bdb-ll",
+					GF_LOG_DEBUG,
+					"setting bctx lru limit to %d", table->lru_limit);
+			} else {
+				table->lru_limit = BDB_DEFAULT_LRU_LIMIT;
+			}
+		}
+
+		{
+			page_size = dict_get (options, "page-size");
+        
+			if (page_size)
+			{
+				if (gf_string2bytesize (page_size->data, 
+							&table->page_size) != 0) {
+					gf_log ("bdb-ll", 
+						GF_LOG_ERROR, 
+						"invalid number format \"%s\""
+						" of \"option page-size\"", 
+						page_size->data);
+				}
+            
+				if (!(table->page_size >= BDB_LL_PAGE_SIZE_MIN && 
+				      table->page_size <= BDB_LL_PAGE_SIZE_MAX)) {
+					gf_log ("bdb-ll", 
+						GF_LOG_ERROR, 
+						"pagesize %s is out of range."
+						"Allowed pagesize is between %d and %d", 
+						page_size->data, 
+						BDB_LL_PAGE_SIZE_MIN, 
+						BDB_LL_PAGE_SIZE_MAX);
+				}
+			}
+			else {
+				table->page_size = BDB_LL_PAGE_SIZE_DEFAULT;
+			}
+			gf_log ("bdb-ll", 
+				GF_LOG_DEBUG, "using page-size %"PRIu64, 
+				table->page_size);
+		}
+      
+		table->hash_size = BDB_DEFAULT_HASH_SIZE;
+		table->b_hash = CALLOC (BDB_DEFAULT_HASH_SIZE, sizeof (struct list_head));
+
+		for (idx = 0; idx < table->hash_size; idx++)
+			INIT_LIST_HEAD(&(table->b_hash[idx]));
+
+		private->b_table = table;
+	} else {
+		gf_log ("bdb-ll",
+			GF_LOG_CRITICAL,
+			"failed to allocate bctx table: out of memory");
+	}
+}
+
+static inline void 
+BDB_DIRECTORY_INIT (xlator_t *this, 
+		    dict_t *options, 
+		    struct bdb_private *private)
+{
+	data_t *directory = NULL;
+	data_t *logdir = NULL;
+	int32_t op_ret = -1;
+	struct stat stbuf = {0};
+
+	directory = dict_get (options, "directory");
+    
+	if (directory) {
+		logdir = dict_get (options, "logdir");
+        
+		if (logdir == NULL) {
+			gf_log ("bdb-ll",
+				GF_LOG_DEBUG,
+				"using default logdir as database home");
+			private->logdir = strdup (directory->data);
+					
+		} else {
+			private->logdir = strdup (logdir->data);
+			gf_log ("bdb-ll",
+				GF_LOG_DEBUG,
+				"using logdir: %s", private->logdir);
+			umask (000);
+			if (mkdir (private->logdir, 0777) == 0) {
+				gf_log ("bdb-ll", GF_LOG_WARNING,
+					"logdir specified (%s) not exists, created", 
+					private->logdir);
+			}
+            
+			op_ret = stat (private->logdir, &stbuf);
+			if ((op_ret != 0) || !S_ISDIR (stbuf.st_mode)) {
+				gf_log ("bdb-ll", 
+					GF_LOG_ERROR, 
+					"specified logdir doesn't exist, "
+					"using default (environment home directory: %s)", 
+					directory->data);
+				private->logdir = strdup (directory->data);
+			}
+		}
+
+		private->b_table->dbenv = bdb_dbenv_init (this, directory->data);
+      
+		if (!private->b_table->dbenv) {
+			gf_log ("bdb-ll", GF_LOG_ERROR,
+				"failed to initialize db environment");
+			FREE (private);
+			op_ret = -1;
+		} else {
+			if (private->transaction) {
+				/* all well, start the checkpointing thread */
+				LOCK_INIT (&private->active_lock);
+				
+				LOCK (&private->active_lock);
+				private->active = 1;
+				UNLOCK (&private->active_lock);
+				pthread_create (&private->checkpoint_thread, NULL,
+						bdb_checkpoint, this);
+			}
+		}
+	}
+}
+
+static inline void
+BDB_DIR_MODE_INIT (xlator_t *this,
+		   dict_t *options, 
+		   struct bdb_private *private)
+{
+	data_t *dir_mode = NULL;
+	char *endptr = NULL;
+
+	dir_mode = dict_get (options, "dir-mode");
+
+	if (dir_mode) {
+		private->dir_mode = strtol (dir_mode->data, &endptr, 8);
+		if ((*endptr) || 
+		    (!IS_VALID_FILE_MODE(private->dir_mode))) {
+			gf_log (this->name,
+				GF_LOG_DEBUG,
+				"invalid dir-mode %o. setting to default %o", 
+				private->dir_mode, 
+				DEFAULT_DIR_MODE);
+			private->dir_mode = DEFAULT_DIR_MODE;
+		} else {
+			gf_log (this->name,
+				GF_LOG_DEBUG,
+				"setting dir-mode to %o", private->dir_mode);
+			private->dir_mode = private->dir_mode;
+		}
+	} else {
+		private->dir_mode = DEFAULT_DIR_MODE;
+	}
+    
+	private->dir_mode = private->dir_mode | S_IFDIR;
+}
+
+static inline void
+BDB_FILE_MODE_INIT (xlator_t *this,
+		    dict_t *options, 
+		    struct bdb_private *private)
+{
+	data_t *file_mode = NULL;
+	char *endptr = NULL;
+
+	file_mode = dict_get (options, "file-mode");
+
+	if (file_mode) {
+		private->file_mode = strtol (file_mode->data, &endptr, 8);
+
+		if ((*endptr) || 
+		    (!IS_VALID_FILE_MODE(private->file_mode))) {
+			gf_log (this->name,
+				GF_LOG_DEBUG,
+				"invalid file-mode %o. setting to default %o", 
+				private->file_mode, 
+				DEFAULT_FILE_MODE);
+			private->file_mode = DEFAULT_FILE_MODE;
+		} else {
+			gf_log (this->name,
+				GF_LOG_DEBUG,
+				"setting file-mode to %o", private->file_mode);
+			private->file_mode = private->file_mode;
+		}
+	} else {
+		private->file_mode = DEFAULT_FILE_MODE;
+	}
+    
+	private->symlink_mode = private->file_mode | S_IFLNK;
+	private->file_mode = private->file_mode | S_IFREG;
+}
+
+static inline void
+BDB_CHECKPOINT_TIMEOUT_INIT (xlator_t *this,
+			     dict_t *options, 
+			     struct bdb_private *private)
+{
+	data_t        *checkpoint_timeout = NULL;
+
+	checkpoint_timeout = dict_get (options, "checkpoint-timeout");
+    
+	private->checkpoint_timeout = BDB_DEFAULT_CHECKPOINT_TIMEOUT;
+
+	if (checkpoint_timeout) {
+		private->checkpoint_timeout = strtol (checkpoint_timeout->data, NULL, 0);
+      
+		if (private->checkpoint_timeout < 5 || private->checkpoint_timeout > 60) {
+			gf_log (this->name,
+				GF_LOG_WARNING,
+				"checkpoint-timeout %d seconds too %s", 
+				private->checkpoint_timeout, 
+				(private->checkpoint_timeout < 5)?"low":"high");
+		} else {
+			gf_log (this->name,
+				GF_LOG_DEBUG,
+				"setting checkpoint-timeout to %d seconds", 
+				private->checkpoint_timeout);
+		}
+	} else {
+		gf_log (this->name,
+			GF_LOG_DEBUG,
+			"setting checkpoint-timeout to default: %d seconds", 
+			private->checkpoint_timeout);
+	}
+}
+
+static inline void
+BDB_LOCK_TIMEOUT_INIT (xlator_t *this,
+		       dict_t *options, 
+		       struct bdb_private *private)
+{
+	data_t        *lock_timeout       = NULL;
+
+	lock_timeout = dict_get (options, "lock-timeout");
+    
+	if (lock_timeout) {
+		private->lock_timeout = strtol (lock_timeout->data, NULL, 0);
+      
+		if (private->lock_timeout > 4260000) {
+			/* db allows us to DB_SET_LOCK_TIMEOUT to be set to a
+			 * maximum of 71 mins (4260000 milliseconds) */
+			gf_log (this->name,
+				GF_LOG_DEBUG,
+				"lock-timeout %d, out of range",
+				private->lock_timeout);
+			private->lock_timeout = 0;
+		} else {
+			gf_log (this->name,
+				GF_LOG_DEBUG,
+				"setting lock-timeout to %d milliseconds", 
+				private->lock_timeout);
+		}
+	}
+}
+
+static inline void
+BDB_TRANSACTION_TIMEOUT_INIT (xlator_t *this,
+			      dict_t *options, 
+			      struct bdb_private *private)
+{
+	data_t *txn_timeout = NULL;
+	txn_timeout = dict_get (options, "transaction-timeout");
+    
+	if (txn_timeout) {
+		private->txn_timeout = strtol (txn_timeout->data, NULL, 0);
+      
+		if (private->txn_timeout > 4260000) {
+			/* db allows us to DB_SET_TXN_TIMEOUT to be set to a maximum
+			 * of 71 mins (4260000 milliseconds) */
+			gf_log (this->name,
+				GF_LOG_DEBUG,
+				"transaction-timeout %d, out of range",
+				private->txn_timeout);
+			private->txn_timeout = 0;
+		} else {
+			gf_log (this->name,
+				GF_LOG_DEBUG,
+				"setting transaction-timeout to %d milliseconds", 
+				private->txn_timeout);
+		}
+	}
+}
+
+static inline void
+BDB_TRANSACTION_INIT (xlator_t *this,
+		      dict_t *options, 
+		      struct bdb_private *private)
+{
+	data_t *mode = NULL;
+
+	mode = dict_get (options, "mode");
+    
+	if (mode && !strcmp (mode->data, "off")) {
+		gf_log (this->name,
+			GF_LOG_DEBUG,
+			"cache mode selected");
+		private->envflags = DB_CREATE | DB_INIT_LOG | 
+			DB_INIT_MPOOL | DB_THREAD;
+		private->dbflags = DB_CREATE | DB_THREAD;
+		private->transaction = OFF;
+	} else {
+		gf_log (this->name,
+			GF_LOG_DEBUG,
+			"persistant mode selected");
+		private->transaction = ON;
+		private->envflags = DB_CREATE | DB_INIT_LOCK | DB_INIT_LOG | 
+			DB_INIT_MPOOL | DB_INIT_TXN | DB_RECOVER | DB_THREAD;
+		private->dbflags = DB_CREATE | DB_THREAD;
+	}
+}
+
+static inline void
+BDB_ACCESS_MODE_INIT (xlator_t *this,
+		      dict_t *options, 
+		      struct bdb_private *private)
+{
+	data_t *access_mode = NULL;
+	
+	access_mode = dict_get (options, "access-mode");
+    
+	if (access_mode && !strcmp (access_mode->data, "btree")) {
+		gf_log (this->name,
+			GF_LOG_DEBUG,
+			"using access mode BTREE");
+		private->access_mode = DB_BTREE;
+	} else {
+		gf_log (this->name,
+			GF_LOG_DEBUG,
+			"using access mode HASH");
+		private->access_mode = DB_HASH;
+	}
+}
+
+
+/* bdb_db_init - initialize bdb xlator
+ * 
+ * reads the options from @options dictionary and sets appropriate values in @this->private.
+ * also initializes DB_ENV.
+ *
+ * return: 0 on success or -1 on error (with logging the error through gf_log()).
+ */
+int
+bdb_db_init (xlator_t *this,
+             dict_t *options)
+{
+	/* create a db entry for root */
+	int32_t        op_ret             = 0;
+	bdb_private_t *private            = NULL;
+  
+	private = this->private;
+
+	BDB_CACHE_INIT (this, options, private);
+	
+	BDB_ACCESS_MODE_INIT (this, options, private);
+
+	BDB_TRANSACTION_INIT (this, options, private);
+
+	BDB_TRANSACTION_TIMEOUT_INIT (this, options, private);
+
+	BDB_LOCK_TIMEOUT_INIT (this, options, private);
+
+	{
+		LOCK_INIT (&private->ino_lock);
+		private->next_ino = 2;
+	}
+	
+	BDB_CHECKPOINT_TIMEOUT_INIT (this, options, private);
+	
+	BDB_FILE_MODE_INIT (this, options, private);
+
+	BDB_DIR_MODE_INIT (this, options, private);
+
+	BDB_TABLE_INIT (this, options, private);
+
+	BDB_ERRFILE_INIT (this, options, private);
+
+	BDB_LOG_REMOVE_INIT (this, options, private);
+
+	BDB_DIRECTORY_INIT (this, options, private);
+
+	return op_ret;
+}
diff --git a/xlators/storage/bdb/src/bdb.c b/xlators/storage/bdb/src/bdb.c
new file mode 100644
index 00000000000..e820e867a94
--- /dev/null
+++ b/xlators/storage/bdb/src/bdb.c
@@ -0,0 +1,3371 @@
+/*
+   Copyright (c) 2008, 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/>.
+*/
+
+/* bdb based storage translator - named as 'bdb' translator
+ * 
+ * 
+ * There can be only two modes for files existing on bdb translator:
+ * 1. DIRECTORY - directories are stored by bdb as regular directories on background 
+ * file-system. directories also have an entry in the ns_db.db of their parent directory.
+ * 2. REGULAR FILE - regular files are stored as records in the storage_db.db present in
+ * the directory. regular files also have an entry in ns_db.db
+ *
+ * Internally bdb has a maximum of three different types of logical files associated with
+ * each directory:
+ * 1. storage_db.db - storage database, used to store the data corresponding to regular
+ *                   files in the form of key/value pair. file-name is the 'key' and data
+ *                   is 'value'.
+ * 2. directory (all subdirectories) - any subdirectory will have a regular directory entry.
+ */
+#ifndef _CONFIG_H
+#define _CONFIG_H
+#include "config.h"
+#endif
+
+#define __XOPEN_SOURCE 500
+
+#include <stdint.h>
+#include <sys/time.h>
+#include <errno.h>
+#include <ftw.h>
+#include <libgen.h>
+
+#include "glusterfs.h"
+#include "dict.h"
+#include "logging.h"
+#include "bdb.h"
+#include "xlator.h"
+#include "defaults.h"
+#include "common-utils.h"
+
+/* to be used only by fops, nobody else */
+#define BDB_ENV(this) ((((struct bdb_private *)this->private)->b_table)->dbenv)
+#define B_TABLE(this) (((struct bdb_private *)this->private)->b_table)
+
+
+int32_t 
+bdb_mknod (call_frame_t *frame,
+           xlator_t *this,
+           loc_t *loc,
+           mode_t mode,
+           dev_t dev)
+{
+	int32_t     op_ret     = -1;
+	int32_t     op_errno   = EINVAL;
+	char       *key_string = NULL; /* after translating loc->path to DB key */
+	char       *db_path    = NULL;
+	bctx_t     *bctx       = NULL;
+	struct stat stbuf      = {0,};
+
+
+	GF_VALIDATE_OR_GOTO ("bdb", frame, out);
+	GF_VALIDATE_OR_GOTO ("bdb", this, out);
+	GF_VALIDATE_OR_GOTO (this->name, loc, out);
+
+	if (!S_ISREG(mode)) {
+		gf_log (this->name,
+			GF_LOG_DEBUG,
+			"mknod for non-regular file");
+		op_ret = -1;
+		op_errno = EPERM;
+		goto out;
+	} /* if(!S_ISREG(mode)) */
+  
+	bctx = bctx_parent (B_TABLE(this), loc->path);
+  
+	if (bctx == NULL) {
+		gf_log (this->name,
+			GF_LOG_ERROR,
+			"failed to get bctx for path: %s", loc->path);
+		op_ret = -1;
+		op_errno = ENOENT;
+		goto out;
+	} /* if(bctx == NULL) */
+
+	MAKE_REAL_PATH_TO_STORAGE_DB (db_path, this, bctx->directory);
+	
+	op_ret = lstat (db_path, &stbuf);				
+	op_errno = errno;				
+	if (op_ret != 0) {				
+		gf_log (this->name, GF_LOG_ERROR,	
+			"failed to lstat on %s (%s)",	
+			db_path, strerror (op_errno));		
+		goto out;				
+	}						
+
+	MAKE_KEY_FROM_PATH (key_string, loc->path);
+	op_ret = bdb_db_put (bctx, NULL, key_string, NULL, 0, 0, 0);
+	if (op_ret > 0) {
+		/* create successful */
+		stbuf.st_ino = bdb_inode_transform (stbuf.st_ino, bctx);
+		stbuf.st_mode  = mode;
+		stbuf.st_size = 0;
+		stbuf.st_blocks = BDB_COUNT_BLOCKS (stbuf.st_size, stbuf.st_blksize);
+	} else {
+		gf_log (this->name,
+			GF_LOG_ERROR,
+			"bdb_db_get() failed for path: %s", loc->path);
+		op_ret = -1;
+		op_errno = ENOENT;
+	}/* if (!op_ret)...else */
+
+out:
+	if (bctx) {
+		/* NOTE: bctx_unref always returns success, 
+		 * see description of bctx_unref for more details */
+		bctx_unref (bctx);
+	}
+
+	frame->root->rsp_refs = NULL;  
+  
+	STACK_UNWIND (frame, op_ret, op_errno, loc->inode, &stbuf);
+	return 0;
+}
+
+static inline int32_t
+is_dir_empty (xlator_t *this,
+              loc_t *loc)
+{
+	int32_t        ret       = 1;
+	bctx_t        *bctx      = NULL;
+	DIR           *dir       = NULL;
+	char          *real_path = NULL;
+	void          *dbstat    = NULL;
+	struct dirent *entry     = NULL;
+
+	GF_VALIDATE_OR_GOTO ("bdb", this, out);
+	GF_VALIDATE_OR_GOTO (this->name, loc, out);
+    
+	bctx = bctx_lookup (B_TABLE(this), loc->path);
+	if (bctx == NULL) {
+		gf_log (this->name,
+			GF_LOG_DEBUG, 
+			"failed to get bctx from inode for dir: %s,"
+			"assuming empty directory",
+			loc->path);
+		ret = 1;
+		goto out;
+	}
+
+	dbstat = bdb_db_stat (bctx, NULL, 0);
+	if (dbstat) {
+		switch (bctx->table->access_mode)
+		{
+		case DB_HASH:
+			ret = (((DB_HASH_STAT *)dbstat)->hash_nkeys == 0);
+			break;
+		case DB_BTREE:
+		case DB_RECNO:
+			ret = (((DB_BTREE_STAT *)dbstat)->bt_nkeys == 0);
+			break;
+		case DB_QUEUE:
+			ret = (((DB_QUEUE_STAT *)dbstat)->qs_nkeys == 0);
+			break;
+		case DB_UNKNOWN:
+			gf_log (this->name,
+				GF_LOG_CRITICAL,
+				"unknown access-mode set for db");
+			ret = 0;
+		}
+	} else {
+		gf_log (this->name,
+			GF_LOG_ERROR,
+			"failed to get db stat for db at path: %s", loc->path);
+		ret = 1;
+		goto out;
+	}
+	
+	MAKE_REAL_PATH (real_path, this, loc->path);
+	dir = opendir (real_path);
+	if (dir == NULL) {
+		gf_log (this->name,
+			GF_LOG_DEBUG,
+			"failed to opendir(%s)", loc->path);
+		ret = 0;
+		goto out;
+	}
+
+	while ((entry = readdir (dir))) {
+		if ((!IS_BDB_PRIVATE_FILE(entry->d_name)) && 
+		    (!IS_DOT_DOTDOT(entry->d_name))) {
+			gf_log (this->name,
+				GF_LOG_DEBUG,
+				"directory (%s) not empty, has a non-db entry", 
+				loc->path);
+			ret = 0;
+			break;
+		}/* if(!IS_BDB_PRIVATE_FILE()) */
+	} /* while(true) */
+	closedir (dir);
+out:  
+	if (bctx) {
+		/* NOTE: bctx_unref always returns success, 
+		 * see description of bctx_unref for more details */
+		bctx_unref (bctx);
+	}
+
+	return ret;
+}
+
+int32_t 
+bdb_rename (call_frame_t *frame,
+            xlator_t *this,
+            loc_t *oldloc,
+            loc_t *newloc)
+{
+	struct bdb_private *private      = NULL;
+	bctx_table_t       *table        = NULL;
+	bctx_t             *oldbctx      = NULL;
+	bctx_t             *newbctx      = NULL;
+	bctx_t             *tmpbctx      = NULL;
+	int32_t             op_ret       = -1;
+	int32_t             op_errno     = ENOENT;
+	int32_t             read_size    = 0;
+	struct stat         stbuf        = {0,};
+	struct stat         old_stbuf    = {0,};
+	DB_TXN             *txnid        = NULL;
+	char               *real_newpath = NULL;
+	char               *real_oldpath = NULL;
+	char               *oldkey       = NULL;
+	char               *newkey       = NULL;
+	char               *buf          = NULL; /* pointer to temporary buffer, where
+						  * the contents of a file are read, if
+						  * file being renamed is a regular file */
+	char               *real_db_newpath = NULL;
+	char               *tmp_db_newpath  = NULL;
+
+	GF_VALIDATE_OR_GOTO ("bdb", frame, out);
+	GF_VALIDATE_OR_GOTO ("bdb", this, out);
+	GF_VALIDATE_OR_GOTO (this->name, newloc, out);
+	GF_VALIDATE_OR_GOTO (this->name, oldloc, out);
+    
+	private = this->private;
+	table = private->b_table;
+
+	MAKE_REAL_PATH (real_oldpath, this, oldloc->path);
+
+	if (S_ISREG (oldloc->inode->st_mode)) {
+		oldbctx = bctx_parent (B_TABLE(this), oldloc->path);
+		MAKE_REAL_PATH (real_newpath, this, newloc->path);
+
+		op_ret = lstat (real_newpath, &stbuf);
+		
+		if ((op_ret == 0) && (S_ISDIR (stbuf.st_mode))) {
+			op_ret = -1;
+			op_errno = EISDIR;
+			goto out;
+		} 
+		if (op_ret == 0) {
+			/* destination is a symlink */
+			MAKE_KEY_FROM_PATH (oldkey, oldloc->path);
+			MAKE_KEY_FROM_PATH (newkey, newloc->path);
+
+			op_ret = unlink (real_newpath);
+			op_errno = errno;
+			if (op_ret != 0) {
+				gf_log (this->name,
+					GF_LOG_ERROR,
+					"failed to unlink %s (%s)", 
+					newloc->path, strerror (op_errno));
+				goto out;
+			}
+			newbctx = bctx_parent (B_TABLE (this), newloc->path);
+			GF_VALIDATE_OR_GOTO (this->name, newbctx, out);
+
+			op_ret = bdb_txn_begin (BDB_ENV(this), &txnid);
+
+			if ((read_size = 
+			     bdb_db_get (oldbctx, txnid, oldkey, &buf, 0, 0)) < 0) {
+				bdb_txn_abort (txnid);
+			} else if ((op_ret = 
+				    bdb_db_del (oldbctx, txnid, oldkey)) != 0) {
+				bdb_txn_abort (txnid);
+			} else if ((op_ret = bdb_db_put (newbctx, txnid, 
+							 newkey, buf, 
+							 read_size, 0, 0)) != 0) {
+				bdb_txn_abort (txnid);
+			} else {
+				bdb_txn_commit (txnid);
+			}
+			
+			/* NOTE: bctx_unref always returns success, 
+			 * see description of bctx_unref for more details */
+			bctx_unref (newbctx);
+		} else {
+			/* destination doesn't exist or a regular file */
+			MAKE_KEY_FROM_PATH (oldkey, oldloc->path);
+			MAKE_KEY_FROM_PATH (newkey, newloc->path);
+
+			newbctx = bctx_parent (B_TABLE (this), newloc->path);
+			GF_VALIDATE_OR_GOTO (this->name, newbctx, out);
+
+			op_ret = bdb_txn_begin (BDB_ENV(this), &txnid);
+
+			if ((read_size = bdb_db_get (oldbctx, txnid, 
+						     oldkey, &buf, 
+						     0, 0)) < 0) {
+				bdb_txn_abort (txnid);
+			} else if ((op_ret = bdb_db_del (oldbctx, 
+							 txnid, oldkey)) != 0) {
+				bdb_txn_abort (txnid);
+			} else if ((op_ret = bdb_db_put (newbctx, txnid, 
+							 newkey, buf, 
+							 read_size, 0, 0)) != 0) {
+				bdb_txn_abort (txnid);
+			} else {
+				bdb_txn_commit (txnid);
+			}
+      
+			/* NOTE: bctx_unref always returns success, 
+			 * see description of bctx_unref for more details */
+			bctx_unref (newbctx);
+		}
+		/* NOTE: bctx_unref always returns success, 
+		 * see description of bctx_unref for more details */
+		bctx_unref (oldbctx);
+	} else if (S_ISLNK (oldloc->inode->st_mode)) {
+		MAKE_REAL_PATH (real_newpath, this, newloc->path);
+		op_ret = lstat (real_newpath, &stbuf);
+		if ((op_ret == 0) && (S_ISDIR (stbuf.st_mode))) {
+			op_ret = -1;
+			op_errno = EISDIR;
+			goto out;
+		}
+
+		if (op_ret == 0){
+			/* destination exists and is also a symlink */
+			MAKE_REAL_PATH (real_oldpath, this, oldloc->path);
+			op_ret = rename (real_oldpath, real_newpath);
+			op_errno = errno;
+			
+			if (op_ret != 0) {
+				gf_log (this->name,
+					GF_LOG_ERROR,
+					"failed to rename symlink %s (%s)", 
+					oldloc->path, strerror (op_errno));
+			}
+			goto out;
+		} 
+		
+		/* destination doesn't exist */
+		MAKE_REAL_PATH (real_oldpath, this, oldloc->path);
+		MAKE_KEY_FROM_PATH (newkey, newloc->path);
+		newbctx = bctx_parent (B_TABLE (this), newloc->path);
+		GF_VALIDATE_OR_GOTO (this->name, newbctx, out);
+		
+		op_ret = bdb_db_del (newbctx, txnid, newkey);
+		if (op_ret != 0) {
+			/* no problem */
+		} 
+		op_ret = rename (real_oldpath, real_newpath);
+		op_errno = errno;
+		if (op_ret != 0) {
+			gf_log (this->name, 
+				GF_LOG_ERROR,
+				"failed to rename %s to %s (%s)",
+				oldloc->path, newloc->path, strerror (op_errno));
+			goto out;
+		}
+		/* NOTE: bctx_unref always returns success, 
+		 * see description of bctx_unref for more details */
+		bctx_unref (newbctx);
+	} else if (S_ISDIR (oldloc->inode->st_mode) && 
+		   (old_stbuf.st_nlink == 2)) {
+
+		tmp_db_newpath = tempnam (private->export_path, "rename_temp");
+		GF_VALIDATE_OR_GOTO (this->name, tmp_db_newpath, out);
+
+		MAKE_REAL_PATH (real_newpath, this, newloc->path);
+
+		MAKE_REAL_PATH_TO_STORAGE_DB (real_db_newpath, this, newloc->path);
+
+		oldbctx = bctx_lookup (B_TABLE(this), oldloc->path);
+		op_ret = -1;
+		op_errno = EINVAL;
+		GF_VALIDATE_OR_GOTO (this->name, oldbctx, out);
+
+		op_ret = lstat (real_newpath, &stbuf);
+		if ((op_ret == 0) && 
+		    S_ISDIR (stbuf.st_mode) && 
+		    is_dir_empty (this, newloc)) {
+			
+			tmpbctx = bctx_rename (oldbctx, tmp_db_newpath);
+			op_ret = -1;
+			op_errno = ENOENT;
+			GF_VALIDATE_OR_GOTO (this->name, tmpbctx, out);
+
+			op_ret = rename (real_oldpath, real_newpath);
+			op_errno = errno;
+			if (op_ret != 0) {
+				gf_log (this->name,
+					GF_LOG_ERROR,
+					"rename directory %s to %s failed: %s", 
+					oldloc->path, newloc->path, 
+					strerror (errno));
+				op_ret = bdb_db_rename (table, 
+							tmp_db_newpath, 
+							oldbctx->db_path);
+				if (op_ret != 0) {
+					gf_log (this->name,
+						GF_LOG_ERROR,
+						"renaming temp database back to old db failed"
+						" for directory %s", oldloc->path);
+					goto out;
+				} else {
+					/* this is a error case, set op_errno & op_ret */
+					op_ret = -1;
+					op_errno = ENOENT; /* TODO: errno */
+				}
+			} 
+			op_ret = bdb_db_rename (table, tmp_db_newpath, real_db_newpath);
+			if (op_ret != 0) {
+				gf_log (this->name,
+					GF_LOG_ERROR,
+					"renaming temp database to new db failed"
+					" for directory %s", oldloc->path);
+				goto out;
+			}
+		} else if ((op_ret != 0) && (errno == ENOENT)) {
+			tmp_db_newpath = tempnam (private->export_path, "rename_temp");
+			GF_VALIDATE_OR_GOTO (this->name, tmp_db_newpath, out);
+
+			tmpbctx = bctx_rename (oldbctx, tmp_db_newpath);
+			op_ret = -1;
+			op_errno = ENOENT;
+			GF_VALIDATE_OR_GOTO (this->name, tmpbctx, out);
+
+			op_ret = rename (real_oldpath, real_newpath);
+			op_errno = errno;
+			if (op_ret != 0) {
+				gf_log (this->name,
+					GF_LOG_ERROR,
+					"rename directory %s to %s failed: %s", 
+					oldloc->path, newloc->path, 
+					strerror (errno));
+				op_ret = bdb_db_rename (table, 
+							tmp_db_newpath, 
+							oldbctx->db_path);
+				if (op_ret != 0) {
+					gf_log (this->name,
+						GF_LOG_ERROR,
+						"renaming temp database back to old db failed"
+						" for directory %s", oldloc->path);
+					goto out;
+				} else {
+					/* this is a error case, set op_errno & op_ret */
+					op_ret = -1;
+					op_errno = ENOENT; /* TODO: errno */
+				}
+			} else {
+				op_ret = bdb_db_rename (table, 
+							tmp_db_newpath, 
+							real_db_newpath);
+				if (op_ret != 0) {
+					gf_log (this->name,
+						GF_LOG_ERROR,
+						"renaming temp database to new db failed"
+						" for directory %s", oldloc->path);
+					goto out;
+				} else {
+					/* this is a error case, set op_errno & op_ret */
+					op_ret = -1;
+					op_errno = ENOENT; /* TODO: errno */
+				}
+			}
+		}
+	} else {
+		gf_log (this->name,
+			GF_LOG_CRITICAL,
+			"rename called on non-existent file type");
+		op_ret = -1;
+		op_errno = EPERM;
+	}
+
+out:
+	frame->root->rsp_refs = NULL;
+	STACK_UNWIND (frame, op_ret, op_errno, &stbuf);
+	return 0;
+}
+
+int32_t 
+bdb_link (call_frame_t *frame, 
+          xlator_t *this,
+          loc_t *oldloc,
+          loc_t *newloc)
+{
+	frame->root->rsp_refs = NULL;
+	STACK_UNWIND (frame, -1, EPERM, NULL, NULL);
+	return 0;
+}
+
+int32_t
+is_space_left (xlator_t *this,
+	       size_t size)
+{
+	struct bdb_private *private = this->private;
+	struct statvfs stbuf = {0,};
+	int32_t ret = -1;
+	fsblkcnt_t req_blocks = 0;
+	fsblkcnt_t usable_blocks = 0;
+
+	ret = statvfs (private->export_path, &stbuf);
+	if (ret != 0) {
+		gf_log (this->name,
+			GF_LOG_ERROR,
+			"failed to do statvfs on %s", private->export_path);
+		return 0;
+	} else {
+		req_blocks = (size / stbuf.f_frsize) + 1;
+
+		usable_blocks = (stbuf.f_bfree - BDB_ENOSPC_THRESHOLD); 
+		
+		gf_log (this->name, GF_LOG_DEBUG,
+			"requested size: %"GF_PRI_SIZET"\nfree blocks: %"PRIu64"\nblock size: %lu\nfrag size: %lu",
+			size, stbuf.f_bfree, stbuf.f_bsize, stbuf.f_frsize);
+		
+		if (req_blocks < usable_blocks)
+			return 1;
+		else 
+			return 0;
+	}
+}
+
+int32_t 
+bdb_create (call_frame_t *frame,
+            xlator_t *this,
+            loc_t *loc,
+            int32_t flags,
+            mode_t mode,
+            fd_t *fd)
+{
+	int32_t             op_ret     = -1;
+	int32_t             op_errno   = EPERM;
+	char               *db_path    = NULL;
+	struct stat         stbuf      = {0,};
+	bctx_t             *bctx       = NULL;
+	struct bdb_private *private    = NULL; 
+	char               *key_string = NULL;
+	struct bdb_fd      *bfd        = NULL;
+	
+	GF_VALIDATE_OR_GOTO ("bdb", frame, out);
+	GF_VALIDATE_OR_GOTO ("bdb", this, out);
+	GF_VALIDATE_OR_GOTO (this->name, loc, out);
+	GF_VALIDATE_OR_GOTO (this->name, fd, out);
+
+	private = this->private;
+
+	bctx = bctx_parent (B_TABLE(this), loc->path);
+	op_errno = ENOENT;
+	GF_VALIDATE_OR_GOTO (this->name, bctx, out);
+
+	MAKE_REAL_PATH_TO_STORAGE_DB (db_path, this, bctx->directory);
+	op_ret = lstat (db_path, &stbuf);				
+	op_errno = errno;				
+	if (op_ret != 0) {				
+		gf_log (this->name, GF_LOG_ERROR,	
+			"failed to lstat on %s (%s)",	
+			db_path, strerror (op_errno));		
+		goto out;				
+	}						
+
+	MAKE_KEY_FROM_PATH (key_string, loc->path);
+	op_ret = bdb_db_put (bctx, NULL, key_string, NULL, 0, 0, 0);
+	op_errno = EINVAL;
+	GF_VALIDATE_OR_GOTO (this->name, (op_ret == 0), out);
+	
+        /* create successful */
+	bfd = CALLOC (1, sizeof (*bfd));
+	op_ret = -1;
+	op_errno = ENOMEM;
+	GF_VALIDATE_OR_GOTO (this->name, bfd, out);
+		
+	/* NOTE: bdb_get_bctx_from () returns bctx with a ref */
+	bfd->ctx = bctx; 
+	bfd->key = strdup (key_string);
+	op_ret = -1;
+	op_errno = ENOMEM;
+	GF_VALIDATE_OR_GOTO (this->name, bfd->key, out);
+	
+	BDB_SET_BFD (this, fd, bfd);
+		
+	stbuf.st_ino = bdb_inode_transform (stbuf.st_ino, bctx);
+	stbuf.st_mode = private->file_mode;
+	stbuf.st_size = 0;
+	stbuf.st_nlink = 1;
+	stbuf.st_blocks = BDB_COUNT_BLOCKS (stbuf.st_size, stbuf.st_blksize);
+	op_ret = 0;
+	op_errno = 0;
+out:
+	frame->root->rsp_refs = NULL;
+	STACK_UNWIND (frame, op_ret, op_errno, fd, loc->inode, &stbuf);
+
+	return 0;
+}
+
+
+/* bdb_open
+ *
+ * as input parameters bdb_open gets the file name, i.e key. bdb_open should effectively 
+ * do: store key, open storage db, store storage-db pointer.
+ *
+ */
+int32_t 
+bdb_open (call_frame_t *frame,
+          xlator_t *this,
+          loc_t *loc,
+          int32_t flags,
+          fd_t *fd)
+{
+	int32_t         op_ret     = -1;
+	int32_t         op_errno   = EINVAL;
+	bctx_t         *bctx       = NULL;
+	char           *key_string = NULL;
+	struct bdb_fd  *bfd        = NULL;
+
+	GF_VALIDATE_OR_GOTO ("bdb", frame, out);
+	GF_VALIDATE_OR_GOTO ("bdb", this, out);
+	GF_VALIDATE_OR_GOTO (this->name, loc, out);
+	GF_VALIDATE_OR_GOTO (this->name, fd, out);
+
+	bctx = bctx_parent (B_TABLE(this), loc->path);
+	op_errno = EBADFD;
+	GF_VALIDATE_OR_GOTO (this->name, bctx, out);
+
+	bfd = CALLOC (1, sizeof (*bfd));
+	op_errno = ENOMEM;
+	GF_VALIDATE_OR_GOTO (this->name, bfd, out);
+
+	/* NOTE: bctx_parent () returns bctx with a ref */
+	bfd->ctx = bctx;
+      
+	MAKE_KEY_FROM_PATH (key_string, loc->path);
+	bfd->key = strdup (key_string);
+	op_ret = -1;
+	op_errno = ENOMEM;
+	GF_VALIDATE_OR_GOTO (this->name, bfd->key, out);
+
+	BDB_SET_BFD (this, fd, bfd);
+	op_ret = 0;
+out:
+	frame->root->rsp_refs = NULL;
+	STACK_UNWIND (frame, op_ret, op_errno, fd);
+
+	return 0;
+}
+
+int32_t 
+bdb_readv (call_frame_t *frame,
+           xlator_t *this,
+           fd_t *fd,
+           size_t size,
+           off_t offset)
+{
+	int32_t        op_ret     = -1;
+	int32_t        op_errno   = EINVAL;
+	struct iovec   vec        = {0,};
+	struct stat    stbuf      = {0,};
+	struct bdb_fd *bfd        = NULL;  
+	dict_t        *reply_dict = NULL;
+	char          *buf        = NULL;
+	data_t        *buf_data   = NULL;
+	char          *db_path    = NULL;
+	int32_t        read_size  = 0;
+
+	GF_VALIDATE_OR_GOTO ("bdb", frame, out);
+	GF_VALIDATE_OR_GOTO ("bdb", this, out);
+	GF_VALIDATE_OR_GOTO (this->name, fd, out);
+
+	bfd = bdb_extract_bfd (fd, this);
+	op_errno = EBADFD;
+	GF_VALIDATE_OR_GOTO (this->name, bfd, out);
+
+	MAKE_REAL_PATH_TO_STORAGE_DB (db_path, this, bfd->ctx->directory);
+	op_ret = lstat (db_path, &stbuf);				
+	op_errno = errno;				
+	if (op_ret != 0) {				
+		gf_log (this->name, GF_LOG_ERROR,	
+			"failed to lstat on %s (%s)",	
+			db_path, strerror (op_errno));		
+		goto out;				
+	}						
+
+	/* we are ready to go */
+	op_ret = bdb_db_get (bfd->ctx, NULL, 
+			     bfd->key, &buf, 
+			     size, offset);
+	read_size = op_ret;
+	if (op_ret == -1) {
+		gf_log (this->name,
+			GF_LOG_ERROR,
+			"failed to do db_storage_get()");
+		op_ret = -1;
+		op_errno = ENOENT;
+		goto out;
+	} else if (op_ret == 0) {
+		goto out;
+	}
+
+	buf_data = get_new_data ();
+	op_ret = -1;
+	op_errno = ENOMEM;
+	GF_VALIDATE_OR_GOTO (this->name, buf_data, out);
+
+	reply_dict = get_new_dict ();
+	op_ret = -1;
+	op_errno = ENOMEM;
+	GF_VALIDATE_OR_GOTO (this->name, reply_dict, out);
+
+	buf_data->data      = buf;
+
+	if (size < read_size) {
+		op_ret = size;
+		read_size = size;
+	}
+
+	buf_data->len       = op_ret;
+      
+	dict_set (reply_dict, NULL, buf_data);
+      
+	frame->root->rsp_refs = dict_ref (reply_dict);
+
+	vec.iov_base = buf;
+	vec.iov_len = read_size;
+      
+	stbuf.st_ino = fd->inode->ino;
+	stbuf.st_size = op_ret ; 
+	stbuf.st_blocks = BDB_COUNT_BLOCKS (stbuf.st_size, stbuf.st_blksize);
+	op_ret = size;
+out:  
+	STACK_UNWIND (frame, op_ret, op_errno, &vec, 1, &stbuf);
+
+	if (reply_dict)
+		dict_unref (reply_dict);
+
+	return 0;
+}
+
+
+int32_t 
+bdb_writev (call_frame_t *frame,
+            xlator_t *this,
+            fd_t *fd,
+            struct iovec *vector,
+            int32_t count,
+            off_t offset)
+{
+	int32_t        op_ret   = -1;
+	int32_t        op_errno = EINVAL;
+	struct stat    stbuf    = {0,};
+	struct bdb_fd *bfd      = NULL;
+	int32_t        idx      = 0;
+	off_t          c_off    = offset;
+	int32_t        c_ret    = -1;
+	char          *db_path  = NULL;
+	size_t         total_size = 0;
+
+	GF_VALIDATE_OR_GOTO ("bdb", frame, out);
+	GF_VALIDATE_OR_GOTO ("bdb", this, out);
+	GF_VALIDATE_OR_GOTO (this->name, fd, out);
+	GF_VALIDATE_OR_GOTO (this->name, vector, out);
+
+	bfd = bdb_extract_bfd (fd, this);
+	op_errno = EBADFD;
+	GF_VALIDATE_OR_GOTO (this->name, bfd, out);
+
+	MAKE_REAL_PATH_TO_STORAGE_DB (db_path, this, bfd->ctx->directory);
+	op_ret = lstat (db_path, &stbuf);				
+	op_errno = errno;				
+	if (op_ret != 0) {				
+		gf_log (this->name, GF_LOG_ERROR,	
+			"failed to lstat on %s (%s)",	
+			db_path, strerror (op_errno));		
+		goto out;				
+	}						
+
+ 
+	for (idx = 0; idx < count; idx++)
+		total_size += vector[idx].iov_len;
+     
+	if (!is_space_left (this, total_size)) {
+		gf_log (this->name,
+			GF_LOG_ERROR,
+			"requested storage for %"GF_PRI_SIZET", ENOSPC", total_size);
+		op_ret = -1;
+		op_errno = ENOSPC;
+		goto out;
+	}
+ 
+
+	/* we are ready to go */
+	for (idx = 0; idx < count; idx++) {
+		c_ret = bdb_db_put (bfd->ctx, NULL, 
+				    bfd->key, vector[idx].iov_base, 
+				    vector[idx].iov_len, c_off, 0);
+		if (c_ret != 0) {
+			gf_log (this->name,
+				GF_LOG_ERROR,
+				"failed to do bdb_db_put at offset: %"PRIu64" for file: %s", 
+				c_off, bfd->key);
+			break;
+		} else {
+			c_off += vector[idx].iov_len;
+		}
+		op_ret += vector[idx].iov_len;
+	} /* for(idx=0;...)... */
+    
+	if (c_ret) {
+		/* write failed */
+		gf_log (this->name,
+			GF_LOG_ERROR,
+			"failed to do bdb_db_put(): %s", 
+			db_strerror (op_ret));
+		op_ret = -1;
+		op_errno = EBADFD; /* TODO: search for a more meaningful errno */
+		goto out;
+	} 
+	/* NOTE: we want to increment stbuf->st_size, as stored in db */
+	stbuf.st_size = op_ret;
+	stbuf.st_blocks = BDB_COUNT_BLOCKS (stbuf.st_size, stbuf.st_blksize);
+	op_errno = 0;
+
+out:
+	frame->root->rsp_refs = NULL;
+	STACK_UNWIND (frame, op_ret, op_errno, &stbuf);
+	return 0;
+}
+
+int32_t 
+bdb_flush (call_frame_t *frame,
+           xlator_t *this,
+           fd_t *fd)
+{
+	int32_t        op_ret   = -1;
+	int32_t        op_errno = EPERM;
+	struct bdb_fd *bfd      = NULL;
+	
+	GF_VALIDATE_OR_GOTO ("bdb", frame, out);
+	GF_VALIDATE_OR_GOTO ("bdb", this, out);
+	GF_VALIDATE_OR_GOTO (this->name, fd, out);
+
+	bfd = bdb_extract_bfd (fd, this);
+	op_errno = EBADFD;
+	GF_VALIDATE_OR_GOTO (this->name, bfd, out);
+	
+        /* do nothing */
+	op_ret = 0;
+	op_errno = 0;
+
+out:
+	frame->root->rsp_refs = NULL;
+	STACK_UNWIND (frame, op_ret, op_errno);
+	return 0;
+}
+
+int32_t 
+bdb_release (xlator_t *this,
+	     fd_t *fd)
+{
+  int32_t op_ret = -1;
+  int32_t op_errno = EBADFD;
+  struct bdb_fd *bfd = NULL;
+  
+  if ((bfd = bdb_extract_bfd (fd, this)) == NULL){
+    gf_log (this->name,
+	    GF_LOG_ERROR,
+	    "failed to extract %s specific information from fd:%p", this->name, fd);
+    op_ret = -1;
+    op_errno = EBADFD;
+  } else {
+    bctx_unref (bfd->ctx);
+    bfd->ctx = NULL; 
+    
+    if (bfd->key)
+      free (bfd->key); /* we did strdup() in bdb_open() */
+    free (bfd);
+    op_ret = 0;
+    op_errno = 0;
+  } /* if((fd->ctx == NULL)...)...else */
+
+  return 0;
+}/* bdb_release */
+
+
+int32_t 
+bdb_fsync (call_frame_t *frame,
+           xlator_t *this,
+           fd_t *fd,
+           int32_t datasync)
+{
+	frame->root->rsp_refs = NULL;
+	STACK_UNWIND (frame, 0, 0);
+	return 0;
+}/* bdb_fsync */
+
+static int gf_bdb_lk_log;
+
+int32_t 
+bdb_lk (call_frame_t *frame,
+        xlator_t *this,
+        fd_t *fd,
+        int32_t cmd,
+        struct flock *lock)
+{
+	struct flock nullock = {0, };
+
+	gf_bdb_lk_log++;
+	if (!(gf_bdb_lk_log % GF_UNIVERSAL_ANSWER)) {
+		gf_log (this->name, GF_LOG_ERROR, 
+			"\"features/posix-locks\" translator is not loaded, you need to use it");
+	}
+
+	frame->root->rsp_refs = NULL;
+	STACK_UNWIND (frame, -1, ENOSYS, &nullock);
+	return 0;
+}/* bdb_lk */
+
+/* bdb_lookup
+ *
+ * there are four possibilities for a file being looked up:
+ *  1. file exists and is a directory.
+ *  2. file exists and is a symlink.
+ *  3. file exists and is a regular file.
+ *  4. file does not exist.
+ * case 1 and 2 are handled by doing lstat() on the @loc. if the file is a directory or symlink, 
+ * lstat() succeeds. lookup continues to check if the @loc belongs to case-3 only if lstat() fails.
+ * to check for case 3, bdb_lookup does a bdb_db_get() for the given @loc. (see description of 
+ * bdb_db_get() for more details on how @loc is transformed into db handle and key). if check 
+ * for case 1, 2 and 3 fail, we proceed to conclude that file doesn't exist (case 4).
+ *
+ * @frame:      call frame.
+ * @this:       xlator_t of this instance of bdb xlator.
+ * @loc:        loc_t specifying the file to operate upon.
+ * @need_xattr: if need_xattr != 0, we are asked to return all the extended attributed of @loc, 
+ *             if any exist, in a dictionary. if @loc is a regular file and need_xattr is set, then 
+ *             we look for value of need_xattr. if need_xattr > sizo-of-the-file @loc, then the file
+ *             content of @loc is returned in dictionary of xattr with 'glusterfs.content' as
+ *             dictionary key.
+ *
+ * NOTE: bdb currently supports only directories, symlinks and regular files. 
+ *
+ * NOTE: bdb_lookup returns the 'struct stat' of underlying file itself, in case of directory and 
+ *      symlink (st_ino is modified as bdb allocates its own set of inodes of all files). for 
+ *      regular files, bdb uses 'struct stat' of the database file in which the @loc is stored 
+ *      as templete and modifies st_ino (see bdb_inode_transform for more details), st_mode (can 
+ *      be set in volfile 'option file-mode <mode>'), st_size (exact size of the @loc
+ *      contents), st_blocks (block count on the underlying filesystem to accomodate st_size, 
+ *      see BDB_COUNT_BLOCKS in bdb.h for more details).
+ */
+int32_t
+bdb_lookup (call_frame_t *frame,
+            xlator_t *this,
+            loc_t *loc,
+            dict_t *xattr_req)
+{
+	struct stat stbuf           = {0, };
+	int32_t op_ret              = -1;
+	int32_t op_errno            = ENOENT;
+	dict_t *xattr               = NULL;
+	char *pathname              = NULL;
+	char *directory             = NULL;
+	char *real_path             = NULL;
+	bctx_t *bctx                = NULL;
+	char *db_path               = NULL;
+	struct bdb_private *private = NULL;
+	char *key_string            = NULL;
+	int32_t entry_size          = 0;
+	char *file_content          = NULL;
+	data_t *file_content_data   = NULL;
+	uint64_t   need_xattr       = 0;
+
+	GF_VALIDATE_OR_GOTO ("bdb", frame, out);
+	GF_VALIDATE_OR_GOTO ("bdb", this, out);
+	GF_VALIDATE_OR_GOTO (this->name, loc, out);
+
+	private = this->private;
+
+	MAKE_REAL_PATH (real_path, this, loc->path);
+
+	pathname = strdup (loc->path);
+	GF_VALIDATE_OR_GOTO (this->name, pathname, out);
+
+	directory = dirname (pathname);
+	GF_VALIDATE_OR_GOTO (this->name, directory, out);
+
+	if (!strcmp (directory, loc->path)) {
+		/* SPECIAL CASE: looking up root */
+		op_ret = lstat (real_path, &stbuf);				
+		op_errno = errno;				
+		if (op_ret != 0) {				
+			gf_log (this->name, GF_LOG_ERROR,	
+				"failed to lstat on %s (%s)",	
+				real_path, strerror (op_errno));		
+			goto out;				
+		}						
+
+		/* bctx_lookup() returns NULL only when its time to wind up, 
+		 * we should shutdown functioning */
+		bctx = bctx_lookup (B_TABLE(this), (char *)loc->path);
+		op_ret = -1;
+		op_errno = EINVAL;
+		GF_VALIDATE_OR_GOTO (this->name, bctx, out);
+		
+		stbuf.st_ino = 1;
+		stbuf.st_mode = private->dir_mode;
+	} else {
+		MAKE_KEY_FROM_PATH (key_string, loc->path);
+		op_ret = lstat (real_path, &stbuf);
+		if ((op_ret == 0) && (S_ISDIR (stbuf.st_mode))){
+			bctx = bctx_lookup (B_TABLE(this), (char *)loc->path);
+			op_ret = -1;
+			op_errno = ENOMEM;
+			GF_VALIDATE_OR_GOTO (this->name, bctx, out);
+
+			if (loc->ino) {
+				/* revalidating directory inode */
+				gf_log (this->name,
+					GF_LOG_DEBUG,
+					"revalidating directory %s", (char *)loc->path);
+				stbuf.st_ino = loc->ino;
+			} else {
+				stbuf.st_ino = bdb_inode_transform (stbuf.st_ino, bctx);
+			}
+			stbuf.st_mode = private->dir_mode;
+			op_ret = 0;
+			op_errno = 0;
+			goto out;
+		} else if (op_ret == 0) {
+			/* a symlink */
+			gf_log (this->name,
+				GF_LOG_DEBUG,
+				"lookup called for symlink: %s", loc->path);
+			bctx = bctx_parent (B_TABLE(this), loc->path);
+			op_ret = -1;
+			op_errno = ENOMEM;
+			GF_VALIDATE_OR_GOTO (this->name, bctx, out);
+
+			if (loc->ino) {
+				stbuf.st_ino = loc->ino;
+			} else {
+				stbuf.st_ino = bdb_inode_transform (stbuf.st_ino, bctx);
+			}
+			stbuf.st_mode = private->symlink_mode;
+			op_ret = 0;
+			op_errno = 0;
+			goto out;
+		} 
+		
+		/* for regular files */
+		bctx = bctx_parent (B_TABLE(this), loc->path);
+		op_ret = -1;
+		op_errno = ENOENT;
+		GF_VALIDATE_OR_GOTO (this->name, bctx, out);
+		
+		if (GF_FILE_CONTENT_REQUESTED(xattr_req, &need_xattr)) {
+			entry_size = bdb_db_get (bctx, 
+						 NULL, 
+						 loc->path, 
+						 &file_content, 
+						 0, 0);
+		} else {
+			entry_size = bdb_db_get (bctx, 
+						 NULL, 
+						 loc->path, 
+						 NULL, 
+						 0, 0);
+		}
+		
+		op_ret = entry_size;
+		op_errno = ENOENT;
+		if (op_ret == -1) {
+			gf_log (this->name,
+				GF_LOG_DEBUG,
+				"returning ENOENT for %s", loc->path);
+			goto out;
+		}
+
+		MAKE_REAL_PATH_TO_STORAGE_DB (db_path, this, bctx->directory);
+		op_ret = lstat (db_path, &stbuf);				
+		op_errno = errno;				
+		if (op_ret != 0) {				
+			gf_log (this->name, GF_LOG_ERROR,	
+				"failed to lstat on %s (%s)",	
+				db_path, strerror (op_errno));		
+			goto out;				
+		}						
+		
+		if ((need_xattr >= entry_size)
+		    && (entry_size) && (file_content)) {
+			file_content_data = data_from_dynptr (file_content, 
+							      entry_size);
+			xattr = get_new_dict ();
+			dict_set (xattr, "glusterfs.content", 
+				  file_content_data);
+		} else {
+			if (file_content)
+				free (file_content);
+		}
+
+		if (loc->ino) {
+			/* revalidate */
+			stbuf.st_ino = loc->ino;
+			stbuf.st_size = entry_size;
+			stbuf.st_blocks = BDB_COUNT_BLOCKS (stbuf.st_size, stbuf.st_blksize);
+		} else {
+			/* fresh lookup, create an inode number */
+			stbuf.st_ino = bdb_inode_transform (stbuf.st_ino, bctx);
+			stbuf.st_size = entry_size;
+			stbuf.st_blocks = BDB_COUNT_BLOCKS (stbuf.st_size, stbuf.st_blksize);
+		}/* if(inode->ino)...else */
+		stbuf.st_nlink = 1;
+		stbuf.st_mode = private->file_mode;
+	}
+	op_ret = 0;
+out:  
+	if (bctx) {
+		/* NOTE: bctx_unref always returns success, 
+		 * see description of bctx_unref for more details */
+		bctx_unref (bctx);
+	}
+
+	if (pathname)
+		free (pathname);
+  
+	if (xattr)
+		dict_ref (xattr);
+
+	frame->root->rsp_refs = NULL;
+	STACK_UNWIND (frame, op_ret, op_errno, loc->inode, &stbuf, xattr);
+  
+	if (xattr)
+		dict_unref (xattr);
+
+	return 0;
+  
+}/* bdb_lookup */
+
+int32_t
+bdb_stat (call_frame_t *frame,
+          xlator_t *this,
+          loc_t *loc)
+{
+ 
+	struct stat stbuf           = {0,};
+	char *real_path             = NULL;
+	int32_t op_ret              = -1;
+	int32_t op_errno            = EINVAL;
+	struct bdb_private *private = NULL;
+	char *db_path               = NULL;
+	bctx_t *bctx                = NULL;
+	
+	GF_VALIDATE_OR_GOTO ("bdb", frame, out);
+	GF_VALIDATE_OR_GOTO ("bdb", this, out);
+	GF_VALIDATE_OR_GOTO (this->name, loc, out);
+
+	private = this->private;
+	GF_VALIDATE_OR_GOTO (this->name, private, out);
+
+	MAKE_REAL_PATH (real_path, this, loc->path);
+
+	op_ret = lstat (real_path, &stbuf);
+	op_errno = errno;
+  	if (op_ret == 0) {
+		/* directory or symlink */
+		stbuf.st_ino = loc->inode->ino;
+		if (S_ISDIR(stbuf.st_mode))
+			stbuf.st_mode = private->dir_mode;
+		else
+			stbuf.st_mode = private->symlink_mode;
+		/* we are done, lets unwind the stack */
+		goto out;
+	} 
+
+	bctx = bctx_parent (B_TABLE(this), loc->path);
+	op_ret = -1;
+	op_errno = ENOENT;
+	GF_VALIDATE_OR_GOTO (this->name, bctx, out);
+  
+	MAKE_REAL_PATH_TO_STORAGE_DB (db_path, this, bctx->directory);
+	op_ret = lstat (db_path, &stbuf);				
+	op_errno = errno;				
+	if (op_ret != 0) {				
+		gf_log (this->name, GF_LOG_ERROR,	
+			"failed to lstat on %s (%s)",	
+			db_path, strerror (op_errno));		
+		goto out;				
+	}						
+
+	stbuf.st_size = bdb_db_get (bctx, NULL, loc->path, NULL, 0, 0);
+	stbuf.st_blocks = BDB_COUNT_BLOCKS (stbuf.st_size, stbuf.st_blksize);
+	stbuf.st_ino = loc->inode->ino;
+	
+out:
+	if (bctx) {
+		/* NOTE: bctx_unref always returns success, 
+		 * see description of bctx_unref for more details */
+		bctx_unref (bctx);
+	}
+
+	frame->root->rsp_refs = NULL;
+	STACK_UNWIND (frame, op_ret, op_errno, &stbuf);
+
+	return 0;
+}/* bdb_stat */
+
+
+
+/* bdb_opendir - in the world of bdb, open/opendir is all about opening correspondind databases.
+ *               opendir in particular, opens the database for the directory which is
+ *               to be opened. after opening the database, a cursor to the database is also created.
+ *               cursor helps us get the dentries one after the other, and cursor maintains the state
+ *               about current positions in directory. pack 'pointer to db', 'pointer to the
+ *               cursor' into struct bdb_dir and store it in fd->ctx, we get from our parent xlator.
+ *
+ * @frame: call frame
+ * @this:  our information, as we filled during init()
+ * @loc:   location information
+ * @fd:    file descriptor structure (glusterfs internal)
+ *
+ * return value - immaterial, async call.
+ *
+ */
+int32_t 
+bdb_opendir (call_frame_t *frame,
+             xlator_t *this,
+             loc_t *loc, 
+             fd_t *fd)
+{
+	char           *real_path = NULL;
+	int32_t         op_ret    = -1;
+	int32_t         op_errno  = EINVAL;
+	bctx_t         *bctx      = NULL;
+	struct bdb_dir *bfd       = NULL;
+  
+	GF_VALIDATE_OR_GOTO ("bdb", frame, out);
+	GF_VALIDATE_OR_GOTO ("bdb", this, out);
+	GF_VALIDATE_OR_GOTO (this->name, loc, out);
+	GF_VALIDATE_OR_GOTO (this->name, fd, out);
+
+	MAKE_REAL_PATH (real_path, this, loc->path);
+
+	bctx = bctx_lookup (B_TABLE(this), (char *)loc->path);
+	op_errno = EBADFD;
+	GF_VALIDATE_OR_GOTO (this->name, bctx, out);
+
+	bfd = CALLOC (1, sizeof (*bfd));
+	op_errno = ENOMEM;
+	GF_VALIDATE_OR_GOTO (this->name, bfd, out);
+
+	bfd->dir = opendir (real_path);
+	op_errno = errno;
+	GF_VALIDATE_OR_GOTO (this->name, bfd->dir, out);
+
+	/* NOTE: bctx_lookup() return bctx with ref */
+	bfd->ctx = bctx; 
+
+	bfd->path = strdup (real_path);
+	op_errno = ENOMEM;
+	GF_VALIDATE_OR_GOTO (this->name, bfd->path, out);
+
+	BDB_SET_BFD (this, fd, bfd);
+	op_ret = 0;
+out:  
+	frame->root->rsp_refs = NULL;
+	STACK_UNWIND (frame, op_ret, op_errno, fd);
+
+	return 0;
+}/* bdb_opendir */
+
+
+int32_t
+bdb_getdents (call_frame_t *frame,
+              xlator_t     *this,
+              fd_t         *fd,
+              size_t        size,
+              off_t         off,
+              int32_t       flag)
+{
+	int32_t         op_ret         = -1;
+	int32_t         op_errno       = EINVAL;
+	int32_t         ret            = -1;
+	int32_t         real_path_len  = 0;
+	int32_t         entry_path_len = 0;
+	int32_t         count          = 0;
+	char           *real_path      = NULL;
+	char           *entry_path     = NULL;
+	char           *db_path        = NULL;
+	dir_entry_t     entries        = {0, };
+	dir_entry_t    *tmp            = NULL;
+	DIR            *dir            = NULL;
+	struct dirent  *dirent         = NULL;
+	struct bdb_dir *bfd            = NULL;
+	struct stat     db_stbuf       = {0,};
+	struct stat     buf            = {0,};
+	DBC            *cursorp        = NULL;
+	size_t          tmp_name_len   = 0;
+
+	GF_VALIDATE_OR_GOTO ("bdb", frame, out);
+	GF_VALIDATE_OR_GOTO ("bdb", this, out);
+	GF_VALIDATE_OR_GOTO (this->name, fd, out);
+
+	bfd = bdb_extract_bfd (fd, this);
+	op_errno = EBADFD;
+	GF_VALIDATE_OR_GOTO (this->name, bfd, out);
+
+	MAKE_REAL_PATH (real_path, this, bfd->path);
+	dir = bfd->dir;
+
+	while ((dirent = readdir (dir))) {
+		if (!dirent)
+			break;
+    
+		if (IS_BDB_PRIVATE_FILE(dirent->d_name)) {
+			continue;
+		}
+
+		tmp_name_len = strlen (dirent->d_name);
+		if (entry_path_len < (real_path_len + 1 + (tmp_name_len) + 1)) {
+			entry_path_len = real_path_len + tmp_name_len + 1024;
+			entry_path = realloc (entry_path, entry_path_len);
+			op_errno = ENOMEM;
+			GF_VALIDATE_OR_GOTO (this->name, entry_path, out);
+		}
+		
+		strncpy (&entry_path[real_path_len+1], dirent->d_name, tmp_name_len);
+		op_ret = stat (entry_path, &buf);				
+		op_errno = errno;				
+		if (op_ret != 0) {				
+			gf_log (this->name, GF_LOG_ERROR,	
+				"failed to lstat on %s (%s)",	
+				entry_path, strerror (op_errno));		
+			goto out;				
+		}						
+
+		if ((flag == GF_GET_DIR_ONLY) && 
+		    (ret != -1 && !S_ISDIR(buf.st_mode))) {
+			continue;
+		}
+
+		tmp = CALLOC (1, sizeof (*tmp));
+		op_errno = ENOMEM;
+		GF_VALIDATE_OR_GOTO (this->name, tmp, out);
+
+		tmp->name = strdup (dirent->d_name);		       
+		op_errno = ENOMEM;
+		GF_VALIDATE_OR_GOTO (this->name, dirent->d_name, out);
+		
+		memcpy (&tmp->buf, &buf, sizeof  (buf));
+
+		tmp->buf.st_ino = -1;
+		if (S_ISLNK(tmp->buf.st_mode)) {
+			char linkpath[ZR_PATH_MAX] = {0,};
+			ret = readlink (entry_path, linkpath, ZR_PATH_MAX);
+			if (ret != -1) {
+				linkpath[ret] = '\0';
+				tmp->link = strdup (linkpath);
+			}
+		} else {
+			tmp->link = "";
+		}
+
+		count++;
+        
+		tmp->next = entries.next;
+		entries.next = tmp;
+		/* if size is 0, count can never be = size, so entire dir is read */
+
+		if (count == size)
+			break;
+	}
+    
+	if ((flag != GF_GET_DIR_ONLY) && (count < size)) {
+		/* read from db */
+		op_ret = bdb_cursor_open (bfd->ctx, &cursorp);
+		op_errno = EINVAL;
+		GF_VALIDATE_OR_GOTO (this->name, (op_ret == 0), out);
+        
+		MAKE_REAL_PATH_TO_STORAGE_DB (db_path, this, bfd->ctx->directory);
+		op_ret = lstat (db_path, &db_stbuf);				
+		op_errno = errno;				
+		if (op_ret != 0) {				
+			gf_log (this->name, GF_LOG_ERROR,	
+				"failed to lstat on %s (%s)",	
+				db_path, strerror (op_errno));		
+			goto out;				
+		}						
+
+		/* read all the entries in database, one after the other and put into dictionary */
+		while (1) {
+			DBT key = {0,}, value = {0,};
+          
+			key.flags = DB_DBT_MALLOC;
+			value.flags = DB_DBT_MALLOC;
+			op_ret = bdb_cursor_get (cursorp, &key, &value, DB_NEXT);
+          
+			if (op_ret == DB_NOTFOUND) {
+				gf_log (this->name,
+					GF_LOG_DEBUG,
+					"end of list of key/value pair in db for directory: %s", 
+					bfd->ctx->directory);
+				op_ret = 0;
+				op_errno = 0;
+				break;
+			} else if (op_ret != 0){
+				gf_log (this->name,
+					GF_LOG_ERROR,
+					"failed to do cursor get for directory %s: %s", 
+					bfd->ctx->directory, db_strerror (op_ret));
+				op_ret = -1;
+				op_errno = ENOENT;
+				break;
+			}
+			/* successfully read */
+			tmp = CALLOC (1, sizeof (*tmp));
+			op_errno = ENOMEM;
+			GF_VALIDATE_OR_GOTO (this->name, tmp, out);
+
+			tmp->name = CALLOC (1, key.size + 1);
+			op_errno = ENOMEM;
+			GF_VALIDATE_OR_GOTO (this->name, tmp->name, out);
+
+			memcpy (tmp->name, key.data, key.size);
+			tmp->buf = db_stbuf;
+			tmp->buf.st_size = bdb_db_get (bfd->ctx, NULL, 
+						       tmp->name, NULL, 
+						       0, 0);
+			tmp->buf.st_blocks = BDB_COUNT_BLOCKS (tmp->buf.st_size, \
+							       tmp->buf.st_blksize);
+			/* FIXME: wat will be the effect of this? */
+			tmp->buf.st_ino = -1;
+			count++;
+        
+			tmp->next = entries.next;
+			tmp->link = "";
+			entries.next = tmp;
+			/* if size is 0, count can never be = size, so entire dir is read */
+			if (count == size)
+				break;
+
+			free (key.data);
+		} /* while(1){ } */
+		bdb_cursor_close (bfd->ctx, cursorp);
+	} else {
+		/* do nothing */
+	}
+	FREE (entry_path);
+	op_ret = 0;
+
+out:
+	frame->root->rsp_refs = NULL;
+	STACK_UNWIND (frame, op_ret, op_errno, &entries, count);
+
+	while (entries.next) {
+		tmp = entries.next;
+		entries.next = entries.next->next;
+		FREE (tmp->name);
+		FREE (tmp);
+	}
+	return 0;
+}/* bdb_getdents */
+
+
+int32_t 
+bdb_releasedir (xlator_t *this,
+		fd_t *fd)
+{
+  int32_t op_ret = 0;
+  int32_t op_errno = 0;
+  struct bdb_dir *bfd = NULL;
+
+  if ((bfd = bdb_extract_bfd (fd, this)) == NULL) {
+    gf_log (this->name, 
+	    GF_LOG_ERROR, 
+	    "failed to extract fd data from fd=%p", fd);
+    op_ret = -1;
+    op_errno = EBADF;
+  } else {
+    if (bfd->path) {
+      free (bfd->path);
+    } else {
+      gf_log (this->name, GF_LOG_ERROR, "bfd->path was NULL. fd=%p bfd=%p",
+	      fd, bfd);
+    }
+    
+    if (bfd->dir) {
+      closedir (bfd->dir);
+    } else {
+      gf_log (this->name,
+	      GF_LOG_ERROR,
+	      "bfd->dir is NULL.");
+    }
+    if (bfd->ctx) {
+      bctx_unref (bfd->ctx);
+    } else {
+      gf_log (this->name,
+	      GF_LOG_ERROR,
+	      "bfd->ctx is NULL");
+    }
+    free (bfd);
+  }
+
+  return 0;
+}/* bdb_releasedir */
+
+
+int32_t 
+bdb_readlink (call_frame_t *frame,
+              xlator_t *this,
+              loc_t *loc,
+              size_t size)
+{
+	char   *dest      = NULL;
+	int32_t op_ret    = -1;
+	int32_t op_errno  = EPERM;
+	char   *real_path = NULL;
+
+	GF_VALIDATE_OR_GOTO ("bdb", frame, out);
+	GF_VALIDATE_OR_GOTO ("bdb", this, out);
+	GF_VALIDATE_OR_GOTO (this->name, loc, out);
+
+	dest = alloca (size + 1);
+	GF_VALIDATE_OR_GOTO (this->name, dest, out);
+
+	MAKE_REAL_PATH (real_path, this, loc->path);
+  
+	op_ret = readlink (real_path, dest, size);
+  
+	if (op_ret > 0)
+		dest[op_ret] = 0;
+
+	op_errno = errno;
+  
+	if (op_ret == -1) {
+		gf_log (this->name,
+			GF_LOG_DEBUG,
+			"readlink failed on %s: %s", 
+			loc->path, strerror (op_errno));
+	}
+out:
+	frame->root->rsp_refs = NULL;
+	STACK_UNWIND (frame, op_ret, op_errno, dest);
+
+	return 0;
+}/* bdb_readlink */
+
+
+int32_t 
+bdb_mkdir (call_frame_t *frame,
+           xlator_t *this,
+           loc_t *loc,
+           mode_t mode)
+{
+	int32_t op_ret = -1;
+	int32_t ret = -1;
+	int32_t op_errno = EINVAL;
+	char *real_path = NULL;
+	struct stat stbuf = {0, };
+	bctx_t *bctx = NULL;
+	
+	GF_VALIDATE_OR_GOTO ("bdb", frame, out);
+	GF_VALIDATE_OR_GOTO ("bdb", this, out);
+	GF_VALIDATE_OR_GOTO (this->name, loc, out);
+
+	MAKE_REAL_PATH (real_path, this, loc->path);
+	
+	op_ret = mkdir (real_path, mode);				
+	op_errno = errno;				
+	if (op_ret != 0) {				
+		gf_log (this->name, GF_LOG_ERROR,	
+			"failed to mkdir %s (%s)",	
+			real_path, strerror (op_errno));		
+		goto out;				
+	}						
+	
+	op_ret = chown (real_path, frame->root->uid, frame->root->gid);				
+	op_errno = errno;				
+	if (op_ret != 0) {				
+		gf_log (this->name, GF_LOG_ERROR,	
+			"failed to chmod on %s (%s)",	
+			real_path, strerror (op_errno));		
+		goto err;				
+	}						
+
+	op_ret = lstat (real_path, &stbuf);				
+	op_errno = errno;				
+	if (op_ret != 0) {				
+		gf_log (this->name, GF_LOG_ERROR,	
+			"failed to lstat on %s (%s)",	
+			real_path, strerror (op_errno));		
+		goto err;				
+	}						
+
+	bctx = bctx_lookup (B_TABLE(this), (char *)loc->path);
+	op_errno = ENOMEM;
+	GF_VALIDATE_OR_GOTO (this->name, bctx, err);
+
+	stbuf.st_ino = bdb_inode_transform (stbuf.st_ino, bctx);
+	
+	goto out;
+
+err:
+	ret = rmdir (real_path);
+	if (ret != 0) {			       
+		gf_log (this->name,
+			GF_LOG_ERROR,
+			"failed to rmdir the directory created (%s)",
+			strerror (errno));
+	}
+	
+
+out:  
+	if (bctx) {
+		/* NOTE: bctx_unref always returns success, 
+		 * see description of bctx_unref for more details */
+		bctx_unref (bctx);
+	}
+
+	frame->root->rsp_refs = NULL;
+	STACK_UNWIND (frame, op_ret, op_errno, loc->inode, &stbuf);
+
+	return 0;
+}/* bdb_mkdir */
+
+
+int32_t 
+bdb_unlink (call_frame_t *frame,
+            xlator_t *this,
+            loc_t *loc)
+{
+	int32_t op_ret    = -1;
+	int32_t op_errno  = EINVAL;
+	bctx_t *bctx      = NULL;
+	char   *real_path = NULL;
+
+  	GF_VALIDATE_OR_GOTO ("bdb", frame, out);
+	GF_VALIDATE_OR_GOTO ("bdb", this, out);
+	GF_VALIDATE_OR_GOTO (this->name, loc, out);
+
+	bctx = bctx_parent (B_TABLE(this), loc->path);
+	op_errno = ENOENT;
+	GF_VALIDATE_OR_GOTO (this->name, bctx, out);
+
+	op_ret = bdb_db_del (bctx, NULL, loc->path);
+	if (op_ret == DB_NOTFOUND) {
+		MAKE_REAL_PATH (real_path, this, loc->path);
+		op_ret = unlink (real_path);				
+		op_errno = errno;				
+		if (op_ret != 0) {				
+			gf_log (this->name, GF_LOG_ERROR,	
+				"failed to unlink on %s (%s)",	
+				real_path, strerror (op_errno));		
+			goto out;				
+		}						
+
+	} else if (op_ret == 0) {
+		op_errno = 0;
+	}
+out:
+	if (bctx) {
+		/* NOTE: bctx_unref always returns success, 
+		 * see description of bctx_unref for more details */
+		bctx_unref (bctx);
+	}
+
+	frame->root->rsp_refs = NULL;
+	STACK_UNWIND (frame, op_ret, op_errno);
+
+	return 0;
+}/* bdb_unlink */
+
+
+
+int32_t
+bdb_do_rmdir (xlator_t *this,
+              loc_t *loc)
+{
+	char   *real_path = NULL;
+	int32_t ret       = -1;
+	bctx_t *bctx      = NULL;
+	DB_ENV *dbenv     = NULL;
+	
+	GF_VALIDATE_OR_GOTO ("bdb", this, out);
+	GF_VALIDATE_OR_GOTO (this->name, loc, out);
+
+	dbenv = BDB_ENV(this);
+	GF_VALIDATE_OR_GOTO (this->name, dbenv, out);
+
+	MAKE_REAL_PATH (real_path, this, loc->path);
+
+	bctx = bctx_lookup (B_TABLE(this), loc->path);
+	GF_VALIDATE_OR_GOTO (this->name, bctx, out);
+	
+	LOCK(&bctx->lock);
+	{
+		if (bctx->dbp == NULL) {
+			goto unlock;
+		}
+	
+		ret = bctx->dbp->close (bctx->dbp, 0);
+		GF_VALIDATE_OR_GOTO (this->name, (ret == 0), unlock);
+
+		bctx->dbp = NULL;
+
+		ret = dbenv->dbremove (dbenv, NULL, bctx->db_path, NULL, 0);
+		if (ret != 0) {
+			gf_log (this->name,
+				GF_LOG_ERROR,
+				"failed to DB_ENV->dbremove() on path %s: %s", 
+				loc->path, db_strerror (ret));
+		}
+	}
+unlock:
+	UNLOCK(&bctx->lock);
+    
+	if (ret) {
+		gf_log (this->name,
+			GF_LOG_ERROR,
+			"failed to remove db %s: %s", bctx->db_path, db_strerror (ret));
+		ret = -1;
+		goto out;
+	} 
+	gf_log (this->name,
+		GF_LOG_DEBUG,
+		"removed db %s", bctx->db_path);
+	ret = rmdir (real_path);
+
+out:
+	if (bctx) {
+		/* NOTE: bctx_unref always returns success, 
+		 * see description of bctx_unref for more details */
+		bctx_unref (bctx);
+	}
+
+	return ret;
+}
+
+int32_t 
+bdb_rmdir (call_frame_t *frame,
+           xlator_t *this,
+           loc_t *loc)
+{
+	int32_t op_ret   = -1; 
+	int32_t op_errno = ENOTEMPTY;
+
+	if (!is_dir_empty (this, loc)) {
+		gf_log (this->name,
+			GF_LOG_DEBUG,
+			"rmdir: directory %s not empty", loc->path);
+		op_errno = ENOTEMPTY;
+		op_ret = -1;
+		goto out;
+	}
+
+	op_ret = bdb_do_rmdir (this, loc);				
+	if (op_ret != 0) {				
+		gf_log (this->name, GF_LOG_ERROR,	
+			"failed to bdb_do_rmdir on %s",	
+			loc->path);		
+		goto out;				
+	}						
+
+out:
+	frame->root->rsp_refs = NULL;
+	STACK_UNWIND (frame, op_ret, op_errno);
+
+	return 0;
+} /* bdb_rmdir */
+
+int32_t 
+bdb_symlink (call_frame_t *frame,
+             xlator_t *this,
+             const char *linkname,
+             loc_t *loc)
+{
+	int32_t             op_ret    = -1;
+	int32_t             op_errno  = EINVAL;
+	char               *real_path = NULL;
+	struct stat         stbuf     = {0,};
+	struct bdb_private *private   = NULL; 
+	bctx_t             *bctx      = NULL;
+	
+	GF_VALIDATE_OR_GOTO ("bdb", frame, out);
+	GF_VALIDATE_OR_GOTO ("bdb", this, out);
+	GF_VALIDATE_OR_GOTO (this->name, loc, out);
+	GF_VALIDATE_OR_GOTO (this->name, linkname, out);
+
+	private = this->private;
+	GF_VALIDATE_OR_GOTO (this->name, private, out);
+
+	MAKE_REAL_PATH (real_path, this, loc->path);
+	op_ret = symlink (linkname, real_path);
+	op_errno = errno;
+	if (op_ret == 0) {
+		op_ret = lstat (real_path, &stbuf);				
+		op_errno = errno;				
+		if (op_ret != 0) {				
+			gf_log (this->name, GF_LOG_ERROR,	
+				"failed to lstat on %s (%s)",	
+				real_path, strerror (op_errno));		
+			goto err;				
+		}						
+
+		bctx = bctx_parent (B_TABLE(this), loc->path);
+		GF_VALIDATE_OR_GOTO (this->name, bctx, err);
+
+		stbuf.st_ino = bdb_inode_transform (stbuf.st_ino, bctx);
+		stbuf.st_mode = private->symlink_mode;
+
+		goto out;
+	}
+err:
+	op_ret = unlink (real_path);
+	op_errno = errno;
+	if (op_ret != 0) {
+		gf_log (this->name, 
+			GF_LOG_ERROR,
+			"failed to unlink the previously created symlink (%s)",
+			strerror (op_errno));
+	}
+	op_ret = -1;
+	op_errno = ENOENT;
+out:
+	if (bctx) {
+		/* NOTE: bctx_unref always returns success, 
+		 * see description of bctx_unref for more details */
+		bctx_unref (bctx);
+	}
+
+	frame->root->rsp_refs = NULL;
+	STACK_UNWIND (frame, op_ret, op_errno, loc->inode, &stbuf);
+
+	return 0;
+} /* bdb_symlink */
+
+int32_t 
+bdb_chmod (call_frame_t *frame,
+           xlator_t *this,
+           loc_t *loc,
+           mode_t mode)
+{
+	int32_t     op_ret    = -1;
+	int32_t     op_errno  = EINVAL;
+	char       *real_path = NULL;
+	struct stat stbuf     = {0,};
+	
+	GF_VALIDATE_OR_GOTO ("bdb", frame, out);
+	GF_VALIDATE_OR_GOTO ("bdb", this, out);
+	GF_VALIDATE_OR_GOTO (this->name, loc, out);
+
+	MAKE_REAL_PATH (real_path, this, loc->path);
+	op_ret = lstat (real_path, &stbuf);				
+	op_errno = errno;				
+	if (op_ret != 0) {				
+		gf_log (this->name, GF_LOG_ERROR,	
+			"failed to lstat on %s (%s)",	
+			real_path, strerror (op_errno));		
+		goto out;				
+	}						
+
+	/* directory or symlink */
+	op_ret = chmod (real_path, mode);
+	op_errno = errno;
+
+out:    
+	frame->root->rsp_refs = NULL;
+	STACK_UNWIND (frame, op_ret, op_errno, &stbuf);
+
+	return 0;
+}/* bdb_chmod */
+
+
+int32_t 
+bdb_chown (call_frame_t *frame,
+           xlator_t *this,
+           loc_t *loc,
+           uid_t uid,
+           gid_t gid)
+{
+	int32_t     op_ret    = -1;
+	int32_t     op_errno  = EINVAL;
+	char       *real_path = NULL;
+	struct stat stbuf     = {0,};
+
+	GF_VALIDATE_OR_GOTO ("bdb", frame, out);
+	GF_VALIDATE_OR_GOTO ("bdb", this, out);
+	GF_VALIDATE_OR_GOTO (this->name, loc, out);
+
+	MAKE_REAL_PATH (real_path, this, loc->path);
+	op_ret = lstat (real_path, &stbuf);				
+	op_errno = errno;				
+	if (op_ret != 0) {				
+		gf_log (this->name, GF_LOG_ERROR,	
+			"failed to lstat on %s (%s)",	
+			real_path, strerror (op_errno));		
+		goto out;				
+	}						
+
+	/* directory or symlink */
+	op_ret = lchown (real_path, uid, gid);
+	op_errno = errno; 
+out:    
+	frame->root->rsp_refs = NULL;  
+	STACK_UNWIND (frame, op_ret, op_errno, &stbuf);
+
+	return 0;
+}/* bdb_chown */
+
+
+int32_t 
+bdb_truncate (call_frame_t *frame,
+              xlator_t *this,
+              loc_t *loc,
+              off_t offset)
+{
+	int32_t     op_ret     = -1;
+	int32_t     op_errno   = EINVAL;
+	char       *real_path  = NULL;
+	struct stat stbuf      = {0,};
+	char       *db_path    = NULL;
+	bctx_t     *bctx       = NULL;
+	char       *key_string = NULL;
+
+	GF_VALIDATE_OR_GOTO ("bdb", frame, out);
+	GF_VALIDATE_OR_GOTO ("bdb", this, out);
+	GF_VALIDATE_OR_GOTO (this->name, loc, out);
+
+	bctx = bctx_parent (B_TABLE(this), loc->path);
+	op_errno = ENOENT;
+	GF_VALIDATE_OR_GOTO (this->name, bctx, out);
+
+	MAKE_REAL_PATH (real_path, this, loc->path);
+	MAKE_KEY_FROM_PATH (key_string, loc->path);
+    
+	/* now truncate */
+	MAKE_REAL_PATH_TO_STORAGE_DB (db_path, this, bctx->directory);
+	op_ret = lstat (db_path, &stbuf);				
+	op_errno = errno;				
+	if (op_ret != 0) {				
+		gf_log (this->name, GF_LOG_ERROR,	
+			"failed to lstat on %s (%s)",	
+			db_path, strerror (op_errno));		
+		goto out;				
+	}						
+
+	if (loc->inode->ino) {
+		stbuf.st_ino = loc->inode->ino;
+	}else {
+		stbuf.st_ino = bdb_inode_transform (stbuf.st_ino, bctx);
+	}
+    
+	op_ret = bdb_db_put (bctx, NULL, key_string, NULL, 0, 1, 0);
+	if (op_ret == -1) {
+		gf_log (this->name,
+			GF_LOG_DEBUG,
+			"failed to do bdb_db_put: %s", 
+			db_strerror (op_ret));
+		op_ret = -1;
+		op_errno = EINVAL; /* TODO: better errno */
+	} 
+
+out:
+	if (bctx) {
+		/* NOTE: bctx_unref always returns success, 
+		 * see description of bctx_unref for more details */
+		bctx_unref (bctx);
+	}
+
+	frame->root->rsp_refs = NULL;
+	STACK_UNWIND (frame, op_ret, op_errno, &stbuf);
+  
+	return 0;
+}/* bdb_truncate */
+
+
+int32_t 
+bdb_utimens (call_frame_t *frame,
+             xlator_t *this,
+             loc_t *loc,
+             struct timespec ts[2])
+{
+	int32_t     op_ret    = -1;
+	int32_t     op_errno  = EPERM;
+	char       *real_path = NULL;
+	struct stat stbuf     = {0,};
+	struct timeval tv[2] = {{0,},};
+  
+	GF_VALIDATE_OR_GOTO ("bdb", frame, out);
+	GF_VALIDATE_OR_GOTO ("bdb", this, out);
+	GF_VALIDATE_OR_GOTO (this->name, loc, out);
+
+	MAKE_REAL_PATH (real_path, this, loc->path);
+	op_ret = lstat (real_path, &stbuf);				
+	op_errno = errno;				
+	if (op_ret != 0) {				
+		op_errno = EPERM;
+		gf_log (this->name, GF_LOG_ERROR,	
+			"failed to lstat on %s (%s)",	
+			real_path, strerror (op_errno));		
+		goto out;				
+	}						
+
+	/* directory or symlink */
+	tv[0].tv_sec = ts[0].tv_sec;
+	tv[0].tv_usec = ts[0].tv_nsec / 1000;
+	tv[1].tv_sec = ts[1].tv_sec;
+	tv[1].tv_usec = ts[1].tv_nsec / 1000;
+    
+	op_ret = lutimes (real_path, tv);
+	if (op_ret == -1 && errno == ENOSYS) {
+		op_ret = utimes (real_path, tv);
+	}
+	op_errno = errno;
+	if (op_ret == -1) {
+		gf_log (this->name, 
+			GF_LOG_WARNING, 
+			"utimes on %s failed: %s", 
+			loc->path, strerror (op_errno));
+		goto out;
+	}
+
+	op_ret = lstat (real_path, &stbuf);				
+	op_errno = errno;				
+	if (op_ret != 0) {				
+		gf_log (this->name, GF_LOG_ERROR,	
+			"failed to lstat on %s (%s)",	
+			real_path, strerror (op_errno));		
+		goto out;				
+	}						
+
+	stbuf.st_ino = loc->inode->ino;
+    
+out:  
+	frame->root->rsp_refs = NULL;
+	STACK_UNWIND (frame, op_ret, op_errno, &stbuf);
+  
+	return 0;
+}/* bdb_utimens */
+
+int32_t 
+bdb_statfs (call_frame_t *frame,
+            xlator_t *this,
+            loc_t *loc)
+
+{
+	int32_t        op_ret    = -1;
+	int32_t        op_errno  = EINVAL;
+	char          *real_path = NULL;
+	struct statvfs buf       = {0, };
+
+	GF_VALIDATE_OR_GOTO ("bdb", frame, out);
+	GF_VALIDATE_OR_GOTO ("bdb", this, out);
+	GF_VALIDATE_OR_GOTO (this->name, loc, out);
+
+	MAKE_REAL_PATH (real_path, this, loc->path);
+
+	op_ret = statvfs (real_path, &buf);
+	op_errno = errno;
+out:
+	frame->root->rsp_refs = NULL;
+	STACK_UNWIND (frame, op_ret, op_errno, &buf);
+	return 0;
+}/* bdb_statfs */
+
+static int gf_bdb_xattr_log;
+
+/* bdb_setxattr - set extended attributes.
+ *
+ * bdb allows setxattr operation only on directories. 
+ *    bdb reservers 'glusterfs.file.<attribute-name>' to operate on the content of the files 
+ * under the specified directory. 'glusterfs.file.<attribute-name>' transforms to contents of 
+ * file of name '<attribute-name>' under specified directory.
+ *
+ * @frame: call frame.
+ * @this:  xlator_t of this instance of bdb xlator.
+ * @loc:   loc_t specifying the file to operate upon.
+ * @dict:  list of extended attributes to set on @loc.
+ * @flags: can be XATTR_REPLACE (replace an existing extended attribute only if it exists) or
+ *         XATTR_CREATE (create an extended attribute only if it doesn't already exist).
+ *
+ *
+ */
+int32_t 
+bdb_setxattr (call_frame_t *frame,
+              xlator_t *this,
+              loc_t *loc,
+              dict_t *dict,
+              int flags)
+{
+	int32_t      op_ret = -1;
+	int32_t      op_errno = EINVAL;
+	data_pair_t *trav = dict->members_list;
+	bctx_t      *bctx = NULL;
+	char        *real_path = NULL;
+	char        *key = NULL;
+
+	GF_VALIDATE_OR_GOTO ("bdb", frame, out);
+	GF_VALIDATE_OR_GOTO ("bdb", this, out);
+	GF_VALIDATE_OR_GOTO (this->name, loc, out);
+	GF_VALIDATE_OR_GOTO (this->name, dict, out);
+
+	MAKE_REAL_PATH (real_path, this, loc->path);
+	if (!S_ISDIR (loc->inode->st_mode)) {
+		op_ret   = -1;
+		op_errno = EPERM;
+		goto out;
+	}
+
+	while (trav) {
+		if (ZR_FILE_CONTENT_REQUEST(trav->key) ) {
+			bctx = bctx_lookup (B_TABLE(this), loc->path);
+			op_errno = EINVAL;
+			GF_VALIDATE_OR_GOTO (this->name, bctx, out);
+
+			key = &(trav->key[15]);
+
+			if (flags & XATTR_REPLACE) {
+				/* replace only if previously exists, otherwise error out */
+				op_ret = bdb_db_get (bctx, NULL, key,
+						     NULL, 0, 0);
+				if (op_ret == -1) {
+					/* key doesn't exist in database */
+					gf_log (this->name,
+						GF_LOG_DEBUG,
+						"cannot XATTR_REPLACE, xattr %s doesn't exist "
+						"on path %s", key, loc->path);
+					op_ret = -1;
+					op_errno = ENOENT;
+					break;
+				} 
+				op_ret = bdb_db_put (bctx, NULL, 
+						     key, trav->value->data, 
+						     trav->value->len, 
+						     op_ret, BDB_TRUNCATE_RECORD);
+				if (op_ret != 0) {
+					op_ret   = -1;
+					op_errno = EINVAL;
+					break;
+				} 
+			} else {
+				/* fresh create */
+				op_ret = bdb_db_put (bctx, NULL, key, 
+						     trav->value->data, 
+						     trav->value->len, 
+						     0, 0);
+				if (op_ret != 0) {
+					op_ret   = -1;
+					op_errno = EINVAL;
+					break;
+				} else {
+					op_ret = 0;
+					op_errno = 0;
+				} /* if(op_ret!=0)...else */
+			} /* if(flags&XATTR_REPLACE)...else */
+			if (bctx) {
+				/* NOTE: bctx_unref always returns success, 
+				 * see description of bctx_unref for more details */
+				bctx_unref (bctx);
+			}
+		} else {
+			/* do plain setxattr */
+			op_ret = lsetxattr (real_path, 
+					    trav->key, 
+					    trav->value->data, 
+					    trav->value->len, 
+					    flags);
+			op_errno = errno;
+			if ((op_ret == -1) && (op_errno != ENOENT)) {
+				if (op_errno == ENOTSUP) {
+					gf_bdb_xattr_log++;
+					if (!(gf_bdb_xattr_log % GF_UNIVERSAL_ANSWER)) {
+						gf_log (this->name, GF_LOG_WARNING, 
+							"Extended Attributes support not present."\
+							"Please check");
+					}
+				} else {
+					gf_log (this->name, GF_LOG_DEBUG, 
+						"setxattr failed on %s (%s)", 
+						loc->path, strerror (op_errno));
+				}
+				break;
+			}
+		} /* if(ZR_FILE_CONTENT_REQUEST())...else */
+		trav = trav->next;
+	}/* while(trav) */
+out:
+	frame->root->rsp_refs = NULL;
+	
+	STACK_UNWIND (frame, op_ret, op_errno);
+	return 0;  
+}/* bdb_setxattr */
+
+
+/* bdb_gettxattr - get extended attributes.
+ *
+ * bdb allows getxattr operation only on directories. 
+ * bdb_getxattr retrieves the whole content of the file, when glusterfs.file.<attribute-name> 
+ * is specified. 
+ *
+ * @frame: call frame.
+ * @this:  xlator_t of this instance of bdb xlator.
+ * @loc:   loc_t specifying the file to operate upon.
+ * @name:  name of extended attributes to get for @loc.
+ *
+ * NOTE: see description of bdb_setxattr for details on how
+ *     'glusterfs.file.<attribute-name>' is handles by bdb.
+ */
+int32_t 
+bdb_getxattr (call_frame_t *frame,
+              xlator_t *this,
+              loc_t *loc,
+              const char *name)
+{
+	int32_t op_ret         = 0; 
+	int32_t op_errno       = 0;
+	dict_t *dict           = NULL;
+	bctx_t *bctx           = NULL; 
+	char   *buf            = NULL;
+	char   *key_string     = NULL;
+	int32_t list_offset    = 0;
+	size_t  size           = 0;
+	size_t  remaining_size = 0;
+	char   *real_path      = NULL;
+	char    key[1024]      = {0,};
+	char   *value          = NULL;
+	char   *list           = NULL;
+	
+	GF_VALIDATE_OR_GOTO ("bdb", frame, out);
+	GF_VALIDATE_OR_GOTO ("bdb", this, out);
+	GF_VALIDATE_OR_GOTO (this->name, loc, out);
+	GF_VALIDATE_OR_GOTO (this->name, name, out);
+
+	dict = get_new_dict ();
+	GF_VALIDATE_OR_GOTO (this->name, dict, out);
+
+	if (!S_ISDIR (loc->inode->st_mode)) {
+		gf_log (this->name,
+			GF_LOG_DEBUG,
+			"operation not permitted on a non-directory file: %s", loc->path);
+		op_ret   = -1;
+		op_errno = ENODATA;
+		goto out;
+	}
+
+	if (name && ZR_FILE_CONTENT_REQUEST(name)) {
+		bctx = bctx_lookup (B_TABLE(this), loc->path);
+		op_errno = EINVAL;
+		GF_VALIDATE_OR_GOTO (this->name, bctx, out);
+
+		key_string = (char *)&(name[15]);
+
+		op_ret = bdb_db_get (bctx, NULL, key_string, &buf, 0, 0);
+		if (op_ret == -1) {
+			gf_log (this->name,
+				GF_LOG_DEBUG,
+				"failed to db get on directory: %s for key: %s", 
+				bctx->directory, name);
+			op_ret   = -1;
+			op_errno = ENODATA;
+			goto out;
+		} 
+		
+		dict_set (dict, (char *)name, data_from_dynptr (buf, op_ret));
+	} else {
+		MAKE_REAL_PATH (real_path, this, loc->path);
+		size = llistxattr (real_path, NULL, 0);
+		op_errno = errno;
+		if (size <= 0) {
+			/* There are no extended attributes, send an empty dictionary */
+			if (size == -1 && op_errno != ENODATA) {
+				if (op_errno == ENOTSUP) {
+					gf_bdb_xattr_log++;
+					if (!(gf_bdb_xattr_log % GF_UNIVERSAL_ANSWER)) 
+						gf_log (this->name, 
+							GF_LOG_WARNING, 
+							"Extended Attributes support not present."\
+							"Please check");
+				} else {
+					gf_log (this->name, 
+						GF_LOG_WARNING, 
+						"llistxattr failed on %s (%s)", 
+						loc->path, strerror (op_errno));
+				}
+			}
+			op_ret = -1;
+			op_errno = ENODATA;
+		} else {
+			list = alloca (size + 1);
+			op_errno = ENOMEM;
+			GF_VALIDATE_OR_GOTO (this->name, list, out);
+
+			size = llistxattr (real_path, list, size);
+			op_ret = size;
+			op_errno = errno;
+			if (size == -1) {
+				gf_log (this->name,
+					GF_LOG_ERROR,
+					"llistxattr failed on %s (%s)",
+					loc->path, strerror (errno));
+				goto out;
+			}
+			remaining_size = size;
+			list_offset = 0;
+			while (remaining_size > 0) {
+				if(*(list+list_offset) == '\0')
+					break;
+				strcpy (key, list + list_offset);
+				op_ret = lgetxattr (real_path, key, NULL, 0);
+				if (op_ret == -1)
+					break;
+				value = CALLOC (op_ret + 1, sizeof(char));
+				GF_VALIDATE_OR_GOTO (this->name, value, out);
+
+				op_ret = lgetxattr (real_path, key, value, op_ret);
+				if (op_ret == -1)
+					break;
+				value [op_ret] = '\0';
+				dict_set (dict, key, data_from_dynptr (value, op_ret));
+				remaining_size -= strlen (key) + 1;
+				list_offset += strlen (key) + 1;
+			} /* while(remaining_size>0) */
+		} /* if(size <= 0)...else */
+	} /* if(name...)...else */
+
+out:
+	if(bctx) {
+		/* NOTE: bctx_unref always returns success, 
+		 * see description of bctx_unref for more details */
+		bctx_unref (bctx);
+	}
+
+	if (dict)
+		dict_ref (dict);
+
+	STACK_UNWIND (frame, op_ret, op_errno, dict);
+
+	if (dict)
+		dict_unref (dict);
+  
+	return 0;
+}/* bdb_getxattr */
+
+
+int32_t 
+bdb_removexattr (call_frame_t *frame,
+                 xlator_t *this,
+                 loc_t *loc,
+                 const char *name)
+{
+	int32_t op_ret    = -1; 
+	int32_t op_errno  = EINVAL;
+	bctx_t *bctx      = NULL;
+	char   *real_path = NULL;
+	
+	GF_VALIDATE_OR_GOTO ("bdb", frame, out);
+	GF_VALIDATE_OR_GOTO ("bdb", this, out);
+	GF_VALIDATE_OR_GOTO (this->name, loc, out);
+	GF_VALIDATE_OR_GOTO (this->name, name, out);
+
+	if (!S_ISDIR(loc->inode->st_mode)) {	
+		gf_log (this->name,
+			GF_LOG_WARNING,
+			"operation not permitted on non-directory files");
+		op_ret = -1;
+		op_errno = EPERM;
+		goto out;
+	} 
+
+	if (ZR_FILE_CONTENT_REQUEST(name)) {
+		bctx = bctx_lookup (B_TABLE(this), loc->path);
+		op_errno = EINVAL;
+		GF_VALIDATE_OR_GOTO (this->name, bctx, out);
+
+		op_ret = bdb_db_del (bctx, NULL, name);
+      		if (op_ret == -1) {
+			gf_log (this->name,
+				GF_LOG_ERROR,
+				"failed to delete %s from db of %s directory", 
+				name, loc->path);
+			op_errno = EINVAL; /* TODO: errno */
+			goto out;
+		} 
+	} else {
+		MAKE_REAL_PATH(real_path, this, loc->path);
+		op_ret = lremovexattr (real_path, name);
+		op_errno = errno;
+		if (op_ret == -1) {
+			if (op_errno == ENOTSUP) {
+				gf_bdb_xattr_log++;
+				if (!(gf_bdb_xattr_log % GF_UNIVERSAL_ANSWER)) 
+					gf_log (this->name, GF_LOG_WARNING, 
+						"Extended Attributes support not present."
+						"Please check");
+			} else {
+				gf_log (this->name, 
+					GF_LOG_WARNING, 
+					"%s: %s", 
+					loc->path, strerror (op_errno));
+			}
+		} /* if(op_ret == -1) */
+	} /* if (ZR_FILE_CONTENT_REQUEST(name))...else */
+
+out:
+	if (bctx) {
+		/* NOTE: bctx_unref always returns success, 
+		 * see description of bctx_unref for more details */
+		bctx_unref (bctx);
+	}
+
+	frame->root->rsp_refs = NULL;  
+	STACK_UNWIND (frame, op_ret, op_errno);
+	return 0;
+}/* bdb_removexattr */
+
+
+int32_t 
+bdb_fsyncdir (call_frame_t *frame,
+	      xlator_t *this,
+	      fd_t *fd,
+	      int datasync)
+{
+	int32_t op_ret = -1;
+	int32_t op_errno = EINVAL;
+	struct bdb_fd *bfd = NULL;
+	
+	GF_VALIDATE_OR_GOTO ("bdb", frame, out);
+	GF_VALIDATE_OR_GOTO ("bdb", this, out);
+	GF_VALIDATE_OR_GOTO (this->name, fd, out);
+	
+	frame->root->rsp_refs = NULL;
+
+	bfd = bdb_extract_bfd (fd, this);
+	op_errno = EBADFD;
+	GF_VALIDATE_OR_GOTO (this->name, bfd, out);
+
+out:
+	STACK_UNWIND (frame, op_ret, op_errno);
+
+	return 0;
+}/* bdb_fsycndir */
+
+
+int32_t 
+bdb_access (call_frame_t *frame,
+	    xlator_t *this,
+	    loc_t *loc,
+	    int32_t mask)
+{
+	int32_t op_ret = -1;
+	int32_t op_errno = EINVAL;
+	char *real_path = NULL;
+
+	GF_VALIDATE_OR_GOTO ("bdb", frame, out);
+	GF_VALIDATE_OR_GOTO ("bdb", this, out);
+	GF_VALIDATE_OR_GOTO (this->name, loc, out);
+	
+	MAKE_REAL_PATH (real_path, this, loc->path);
+
+	op_ret = access (real_path, mask);
+	op_errno = errno;
+	/* TODO: implement for db entries */
+out:
+	frame->root->rsp_refs = NULL;  
+	STACK_UNWIND (frame, op_ret, op_errno);
+	return 0;
+}/* bdb_access */
+
+
+int32_t 
+bdb_ftruncate (call_frame_t *frame,
+	       xlator_t *this,
+	       fd_t *fd,
+	       off_t offset)
+{
+	int32_t op_ret = -1;
+	int32_t op_errno = EPERM;
+	struct stat buf = {0,};
+	
+	GF_VALIDATE_OR_GOTO ("bdb", frame, out);
+	GF_VALIDATE_OR_GOTO ("bdb", this, out);
+	GF_VALIDATE_OR_GOTO (this->name, fd, out);
+	/* TODO: impelement */
+out:	
+	frame->root->rsp_refs = NULL;
+	STACK_UNWIND (frame, op_ret, op_errno, &buf);
+
+	return 0;
+}
+
+int32_t 
+bdb_fchown (call_frame_t *frame,
+            xlator_t *this,
+            fd_t *fd,
+            uid_t uid,
+            gid_t gid)
+{
+	int32_t op_ret = -1;
+	int32_t op_errno = EPERM;
+	struct stat buf = {0,};
+
+	GF_VALIDATE_OR_GOTO ("bdb", frame, out);
+	GF_VALIDATE_OR_GOTO ("bdb", this, out);
+	GF_VALIDATE_OR_GOTO (this->name, fd, out);
+	
+	/* TODO: implement */
+out:	
+	STACK_UNWIND (frame, op_ret, op_errno, &buf);
+
+	return 0;
+}
+
+
+int32_t 
+bdb_fchmod (call_frame_t *frame,
+            xlator_t *this,
+            fd_t *fd,
+            mode_t mode)
+{
+	int32_t op_ret = -1;
+	int32_t op_errno = EPERM;
+	struct stat buf = {0,};
+
+	GF_VALIDATE_OR_GOTO ("bdb", frame, out);
+	GF_VALIDATE_OR_GOTO ("bdb", this, out);
+	GF_VALIDATE_OR_GOTO (this->name, fd, out);
+	
+	/* TODO: impelement */
+out:	
+	frame->root->rsp_refs = NULL;  
+	STACK_UNWIND (frame, op_ret, op_errno, &buf);
+
+	return 0;
+}
+
+int32_t 
+bdb_setdents (call_frame_t *frame,
+              xlator_t *this,
+              fd_t *fd,
+              int32_t flags,
+              dir_entry_t *entries,
+              int32_t count)
+{
+	int32_t op_ret = -1, op_errno = EINVAL;
+	char *entry_path = NULL;
+	int32_t real_path_len = 0;
+	int32_t entry_path_len = 0;
+	int32_t ret = 0;
+	struct bdb_dir *bfd = NULL;
+	dir_entry_t *trav = NULL;
+
+	GF_VALIDATE_OR_GOTO ("bdb", frame, out);
+	GF_VALIDATE_OR_GOTO ("bdb", this, out);
+	GF_VALIDATE_OR_GOTO (this->name, fd, out);
+	GF_VALIDATE_OR_GOTO (this->name, entries, out);
+
+	frame->root->rsp_refs = NULL;
+	
+	bfd = bdb_extract_bfd (fd, this);
+	op_errno = EBADFD;
+	GF_VALIDATE_OR_GOTO (this->name, bfd, out);
+
+	real_path_len = strlen (bfd->path);
+	entry_path_len = real_path_len + 256;
+	entry_path = CALLOC (1, entry_path_len);
+	GF_VALIDATE_OR_GOTO (this->name, entry_path, out);
+
+	strcpy (entry_path, bfd->path);
+	entry_path[real_path_len] = '/';
+      
+	trav = entries->next;
+	while (trav) {
+		char pathname[ZR_PATH_MAX] = {0,};
+		strcpy (pathname, entry_path);
+		strcat (pathname, trav->name);
+        
+		if (S_ISDIR(trav->buf.st_mode)) {
+			/* If the entry is directory, create it by calling 'mkdir'. If 
+			 * directory is not present, it will be created, if its present, 
+			 * no worries even if it fails.
+			 */
+			ret = mkdir (pathname, trav->buf.st_mode);
+			if ((ret == -1) && (errno != EEXIST)) {
+				gf_log (this->name,
+					GF_LOG_ERROR,
+					"failed to created directory %s: %s", 
+					pathname, strerror(errno));
+				goto loop;
+			}
+
+			gf_log (this->name, 
+				GF_LOG_DEBUG, 
+				"Creating directory %s with mode (0%o)", 
+				pathname,
+				trav->buf.st_mode);
+			/* Change the mode 
+			 * NOTE: setdents tries its best to restore the state
+			 *       of storage. if chmod and chown fail, they can be
+			 *       ignored now */
+			ret = chmod (pathname, trav->buf.st_mode);
+			if (ret != 0) {
+				op_ret = -1;
+				op_errno = errno;
+				gf_log (this->name,
+					GF_LOG_ERROR,
+					"chmod failed on %s (%s)",
+					pathname, strerror (errno));
+				goto loop;
+			}
+			/* change the ownership */
+			ret = chown (pathname, trav->buf.st_uid, trav->buf.st_gid);
+			if (ret != 0) {
+				op_ret = -1;
+				op_errno = errno;
+				gf_log (this->name,
+					GF_LOG_ERROR,
+					"chown failed on %s (%s)",
+					pathname, strerror (errno));
+				goto loop;
+			}
+		} else if ((flags == GF_SET_IF_NOT_PRESENT) || 
+			   (flags != GF_SET_DIR_ONLY)) {
+			/* Create a 0 byte file here */
+			if (S_ISREG (trav->buf.st_mode)) {
+				op_ret = bdb_db_put (bfd->ctx, NULL, 
+						     trav->name, NULL, 0, 0, 0);
+				if (op_ret != 0) {
+					/* create successful */
+					gf_log (this->name,
+						GF_LOG_ERROR,
+						"failed to create file %s",
+						pathname);
+				} /* if (!op_ret)...else */
+			} else if (S_ISLNK (trav->buf.st_mode)) {
+				/* TODO: impelement */;
+			} else {
+				gf_log (this->name,
+					GF_LOG_ERROR,
+					"storage/bdb allows to create regular files only"
+					"file %s (mode = %d) cannot be created",
+					pathname, trav->buf.st_mode);
+			} /* if(S_ISREG())...else */
+		} /* if(S_ISDIR())...else if */
+	loop:
+		/* consider the next entry */
+		trav = trav->next;
+	} /* while(trav) */
+
+out:
+	frame->root->rsp_refs = NULL;
+	STACK_UNWIND (frame, op_ret, op_errno);
+  
+	FREE (entry_path);
+	return 0;
+}
+
+int32_t 
+bdb_fstat (call_frame_t *frame,
+           xlator_t *this,
+           fd_t *fd)
+{
+	int32_t        op_ret   = -1;
+	int32_t        op_errno = EINVAL;
+	struct stat    stbuf    = {0,};
+	struct bdb_fd *bfd      = NULL;
+	bctx_t        *bctx     = NULL;
+	char          *db_path  = NULL;
+
+	GF_VALIDATE_OR_GOTO ("bdb", frame, out);
+	GF_VALIDATE_OR_GOTO ("bdb", this, out);
+	GF_VALIDATE_OR_GOTO (this->name, fd, out);
+	
+	bfd      = bdb_extract_bfd (fd, this);
+	op_errno = EBADFD;
+	GF_VALIDATE_OR_GOTO (this->name, bfd, out);
+
+	bctx = bfd->ctx;
+
+	MAKE_REAL_PATH_TO_STORAGE_DB (db_path, this, bctx->directory);
+	op_ret = lstat (db_path, &stbuf);				
+	op_errno = errno;				
+	if (op_ret != 0) {				
+		gf_log (this->name, GF_LOG_ERROR,	
+			"failed to lstat on %s (%s)",	
+			db_path, strerror (op_errno));		
+		goto out;				
+	}						
+
+	stbuf.st_ino = fd->inode->ino;
+	stbuf.st_size = bdb_db_get (bctx, NULL, bfd->key, NULL, 0, 0);
+	stbuf.st_blocks = BDB_COUNT_BLOCKS (stbuf.st_size, stbuf.st_blksize);
+
+out:
+	frame->root->rsp_refs = NULL;
+
+	STACK_UNWIND (frame, op_ret, op_errno, &stbuf);
+	return 0;
+}
+
+
+int32_t
+bdb_readdir (call_frame_t *frame,
+             xlator_t *this,
+             fd_t *fd,
+             size_t size,
+             off_t off)
+{
+	struct bdb_dir *bfd        = NULL;
+	int32_t         op_ret     = -1; 
+	int32_t         op_errno   = EINVAL;
+	size_t          filled     = 0;
+	gf_dirent_t    *this_entry = NULL;
+	gf_dirent_t     entries;
+	struct dirent  *entry      = NULL;
+	off_t           in_case    = 0;
+	int32_t         this_size  = 0;
+	DBC            *cursorp    = NULL;
+	int32_t count = 0;
+
+	GF_VALIDATE_OR_GOTO ("bdb", frame, out);
+	GF_VALIDATE_OR_GOTO ("bdb", this, out);
+	GF_VALIDATE_OR_GOTO (this->name, fd, out);
+
+	INIT_LIST_HEAD (&entries.list);
+	
+	bfd = bdb_extract_bfd (fd, this);
+	op_errno = EBADFD;
+	GF_VALIDATE_OR_GOTO (this->name, bfd, out);
+
+	op_errno = ENOMEM;
+
+	while (filled <= size) {
+		this_entry = NULL;
+		entry      = NULL;
+		in_case    = 0;
+		this_size  = 0;
+        
+		in_case = telldir (bfd->dir);
+		entry = readdir (bfd->dir);
+		if (!entry)
+			break;
+
+		if (IS_BDB_PRIVATE_FILE(entry->d_name))
+			continue;
+		
+		this_size = dirent_size (entry);
+        
+		if (this_size + filled > size) {
+			seekdir (bfd->dir, in_case);
+			break;
+		}
+		
+		count++;
+
+		this_entry = gf_dirent_for_name (entry->d_name);
+		this_entry->d_ino = entry->d_ino;
+          
+		this_entry->d_off = -1;
+          
+		this_entry->d_type = entry->d_type;
+		this_entry->d_len = entry->d_reclen;
+
+
+		list_add (&this_entry->list, &entries.list);
+          
+		filled += this_size;
+	}
+	op_ret = filled;
+	op_errno = 0;
+	if (filled >= size) {
+		goto out;
+	}
+
+	/* hungry kyaa? */
+	op_ret = bdb_cursor_open (bfd->ctx, &cursorp);
+	op_errno = EBADFD;
+	GF_VALIDATE_OR_GOTO (this->name, (op_ret == 0), out);
+
+	/* TODO: fix d_off, don't use bfd->offset. wrong method */
+	if (strlen (bfd->offset)) {
+		DBT key = {0,}, value = {0,};
+		key.data = bfd->offset;
+		key.size = strlen (bfd->offset);
+		key.flags = DB_DBT_USERMEM;
+		value.dlen = 0;
+		value.doff = 0;
+		value.flags = DB_DBT_PARTIAL;
+
+		op_ret = bdb_cursor_get (cursorp, &key, &value, DB_SET);
+		op_errno = EBADFD;
+		GF_VALIDATE_OR_GOTO (this->name, (op_ret == 0), out);
+
+	} else {
+		/* first time or last time, do nothing */
+	}
+
+	while (filled <= size) {
+		DBT key = {0,}, value = {0,};
+            	this_entry = NULL;
+
+		key.flags = DB_DBT_MALLOC;
+		value.dlen = 0;
+		value.doff = 0; 
+		value.flags = DB_DBT_PARTIAL;
+		op_ret = bdb_cursor_get (cursorp, &key, &value, DB_NEXT);
+            
+		if (op_ret == DB_NOTFOUND) {
+			/* we reached end of the directory */
+			op_ret = 0;
+			op_errno = 0;
+			break;
+		} else if (op_ret != 0) {
+			gf_log (this->name,
+				GF_LOG_DEBUG,
+				"database error during readdir");
+			op_ret = -1;
+			op_errno = ENOENT;
+			break;
+		} /* if (op_ret == DB_NOTFOUND)...else if...else */
+
+		if (key.data == NULL) {
+			/* NOTE: currently ignore when we get key.data == NULL.
+			 * TODO: we should not get key.data = NULL */
+			gf_log (this->name,
+				GF_LOG_DEBUG,
+				"null key read from db");
+			continue;
+		}/* if(key.data)...else */
+		count++;
+		this_size = bdb_dirent_size (&key);
+		if (this_size + filled > size)
+			break;
+		/* TODO - consider endianness here */
+		this_entry = gf_dirent_for_name ((const char *)key.data);
+		/* FIXME: bug, if someone is going to use ->d_ino */
+		this_entry->d_ino = -1;
+		this_entry->d_off = 0;
+		this_entry->d_type = 0;
+		this_entry->d_len = key.size;
+                
+		if (key.data) {
+			strncpy (bfd->offset, key.data, key.size);
+			bfd->offset [key.size] = '\0';
+			free (key.data);
+		}
+
+		list_add (&this_entry->list, &entries.list);
+
+		filled += this_size;
+	}/* while */
+	bdb_cursor_close (bfd->ctx, cursorp);
+	op_ret = filled;
+	op_errno = 0;
+out:
+	frame->root->rsp_refs = NULL;
+	gf_log (this->name,
+		GF_LOG_DEBUG,
+		"read %"GF_PRI_SIZET" bytes for %d entries", filled, count);
+	STACK_UNWIND (frame, count, op_errno, &entries);
+
+	gf_dirent_free (&entries);
+    
+	return 0;
+}
+
+
+int32_t 
+bdb_stats (call_frame_t *frame,
+           xlator_t *this,
+           int32_t flags)
+
+{
+	int32_t op_ret = 0;
+	int32_t op_errno = 0;
+
+	struct xlator_stats xlstats = {0, }, *stats = NULL; 
+	struct statvfs buf;
+	struct timeval tv;
+	struct bdb_private *private = NULL;
+	int64_t avg_read = 0;
+	int64_t avg_write = 0;
+	int64_t _time_ms = 0; 
+	
+	GF_VALIDATE_OR_GOTO ("bdb", frame, out);
+	GF_VALIDATE_OR_GOTO ("bdb", this, out);
+
+	private = (struct bdb_private *)(this->private);
+	stats = &xlstats;
+	
+  	op_ret = statvfs (private->export_path, &buf);				
+	op_errno = errno;				
+	if (op_ret != 0) {				
+		gf_log (this->name, GF_LOG_ERROR,	
+			"failed to statvfs on %s (%s)",	
+			private->export_path, strerror (op_errno));		
+		goto out;				
+	}						
+
+	stats->nr_files = private->stats.nr_files;
+	stats->nr_clients = private->stats.nr_clients; /* client info is maintained at FSd */
+	stats->free_disk = buf.f_bfree * buf.f_bsize; /* Number of Free block in the filesystem. */
+	stats->total_disk_size = buf.f_blocks * buf.f_bsize; /* */
+	stats->disk_usage = (buf.f_blocks - buf.f_bavail) * buf.f_bsize;
+
+	/* Calculate read and write usage */
+	gettimeofday (&tv, NULL);
+  
+	/* Read */
+	_time_ms = (tv.tv_sec - private->init_time.tv_sec) * 1000 +
+		((tv.tv_usec - private->init_time.tv_usec) / 1000);
+
+	avg_read = (_time_ms) ? (private->read_value / _time_ms) : 0; /* KBps */
+	avg_write = (_time_ms) ? (private->write_value / _time_ms) : 0; /* KBps */
+  
+	_time_ms = (tv.tv_sec - private->prev_fetch_time.tv_sec) * 1000 +
+		((tv.tv_usec - private->prev_fetch_time.tv_usec) / 1000);
+	if (_time_ms && ((private->interval_read / _time_ms) > private->max_read)) {
+		private->max_read = (private->interval_read / _time_ms);
+	}
+	if (_time_ms && ((private->interval_write / _time_ms) > private->max_write)) {
+		private->max_write = private->interval_write / _time_ms;
+	}
+
+	stats->read_usage = avg_read / private->max_read;
+	stats->write_usage = avg_write / private->max_write;
+
+	gettimeofday (&(private->prev_fetch_time), NULL);
+	private->interval_read = 0;
+	private->interval_write = 0;
+
+out:
+	frame->root->rsp_refs = NULL;
+	STACK_UNWIND (frame, op_ret, op_errno, stats);
+	return 0;
+}
+
+
+int32_t 
+bdb_inodelk (call_frame_t *frame, xlator_t *this,
+	     loc_t *loc, int32_t cmd, struct flock *lock)
+{
+        frame->root->rsp_refs = NULL;
+
+	gf_log (this->name, GF_LOG_CRITICAL,
+		"\"features/posix-locks\" translator is not loaded. You need to use it for proper functioning of GlusterFS");
+
+        STACK_UNWIND (frame, -1, ENOSYS);
+        return 0;
+}
+
+
+int32_t 
+bdb_finodelk (call_frame_t *frame, xlator_t *this,
+	      fd_t *fd, int32_t cmd, struct flock *lock)
+{
+        frame->root->rsp_refs = NULL;
+
+	gf_log (this->name, GF_LOG_CRITICAL,
+		"\"features/posix-locks\" translator is not loaded. You need to use it for proper functioning of GlusterFS");
+
+        STACK_UNWIND (frame, -1, ENOSYS);
+        return 0;
+}
+
+
+int32_t 
+bdb_entrylk (call_frame_t *frame, xlator_t *this,
+	     loc_t *loc, const char *basename, entrylk_cmd cmd, 
+	     entrylk_type type)
+{
+        frame->root->rsp_refs = NULL;
+
+	gf_log (this->name, GF_LOG_CRITICAL,
+		"\"features/posix-locks\" translator is not loaded. You need to use it for proper functioning of GlusterFS");
+
+        STACK_UNWIND (frame, -1, ENOSYS);
+        return 0;
+}
+
+
+int32_t 
+bdb_fentrylk (call_frame_t *frame, xlator_t *this,
+	      fd_t *fd, const char *basename, entrylk_cmd cmd, 
+	      entrylk_type type)
+{
+        frame->root->rsp_refs = NULL;
+
+	gf_log (this->name, GF_LOG_CRITICAL,
+		"\"features/posix-locks\" translator is not loaded. You need to use it for proper functioning of GlusterFS");
+
+        STACK_UNWIND (frame, -1, ENOSYS);
+        return 0;
+}
+
+
+int32_t 
+bdb_checksum (call_frame_t *frame,
+              xlator_t *this,
+              loc_t *loc,
+              int32_t flag)
+{
+	char          *real_path = NULL;
+	DIR           *dir       = NULL;
+	struct dirent *dirent    = NULL;
+	uint8_t        file_checksum[ZR_FILENAME_MAX] = {0,};
+	uint8_t        dir_checksum[ZR_FILENAME_MAX]  = {0,};
+	int32_t        op_ret   = -1;
+	int32_t        op_errno = EINVAL;
+	int32_t        i = 0, length = 0;
+	bctx_t        *bctx    = NULL;
+	DBC           *cursorp = NULL;
+	char          *data    = NULL;
+
+	GF_VALIDATE_OR_GOTO ("bdb", frame, out);
+	GF_VALIDATE_OR_GOTO ("bdb", this, out);
+	GF_VALIDATE_OR_GOTO (this->name, loc, out);
+
+	MAKE_REAL_PATH (real_path, this, loc->path);
+
+	{
+		dir = opendir (real_path);
+		op_errno = errno;
+		GF_VALIDATE_OR_GOTO (this->name, dir, out);
+		while ((dirent = readdir (dir))) {
+			if (!dirent)
+				break;
+        
+			if (IS_BDB_PRIVATE_FILE(dirent->d_name))
+				continue;
+
+			length = strlen (dirent->d_name);
+			for (i = 0; i < length; i++)
+				dir_checksum[i] ^= dirent->d_name[i];
+		} /* while((dirent...)) */
+		closedir (dir);
+	}
+
+	{
+		bctx = bctx_lookup (B_TABLE(this), (char *)loc->path);
+		op_errno = EINVAL;
+		GF_VALIDATE_OR_GOTO (this->name, bctx, out);
+
+		op_ret = bdb_cursor_open (bctx, &cursorp);
+		op_errno = EINVAL;
+		GF_VALIDATE_OR_GOTO (this->name, (op_ret == 0), out);
+
+		while (1) {
+			DBT key = {0,}, value = {0,};
+          
+			key.flags = DB_DBT_MALLOC;
+			value.doff = 0;
+			value.dlen = 0;
+			op_ret = bdb_cursor_get (cursorp, &key, &value, DB_NEXT);
+          
+			if (op_ret == DB_NOTFOUND) {
+				gf_log (this->name,
+					GF_LOG_DEBUG,
+					"end of list of key/value pair in db for "
+					"directory: %s", bctx->directory);
+				op_ret = 0;
+				op_errno = 0;
+				break;
+			} else if (op_ret == 0){
+				/* successfully read */
+				data = key.data;
+				length = key.size;
+				for (i = 0; i < length; i++)
+					file_checksum[i] ^= data[i];
+            
+				free (key.data);
+			} else {
+				gf_log (this->name,
+					GF_LOG_ERROR,
+					"failed to do cursor get for directory %s: %s", 
+					bctx->directory, db_strerror (op_ret));
+				op_ret = -1;
+				op_errno = ENOENT;
+				break;
+			}/* if(op_ret == DB_NOTFOUND)...else if...else */
+		} /* while(1) */
+		bdb_cursor_close (bctx, cursorp);
+	}
+out:
+	if (bctx) {
+		/* NOTE: bctx_unref always returns success, 
+		 * see description of bctx_unref for more details */
+		bctx_unref (bctx);
+	}
+
+	frame->root->rsp_refs = NULL;
+	STACK_UNWIND (frame, op_ret, op_errno, file_checksum, dir_checksum);
+
+	return 0;
+}
+
+/**
+ * notify - when parent sends PARENT_UP, send CHILD_UP event from here
+ */
+int32_t
+notify (xlator_t *this,
+        int32_t event,
+        void *data,
+        ...)
+{
+	switch (event)
+	{
+	case GF_EVENT_PARENT_UP:
+	{
+		/* Tell the parent that bdb xlator is up */
+		assert ((this->private != NULL) && 
+			(BDB_ENV(this) != NULL));
+		default_notify (this, GF_EVENT_CHILD_UP, data);
+	}
+	break;
+	default:
+		/* */
+		break;
+	}
+	return 0;
+}
+
+
+
+/**
+ * init - 
+ */
+int32_t 
+init (xlator_t *this)
+{
+	int32_t             ret = -1;
+	struct stat         buf = {0,};
+	struct bdb_private *_private = NULL;
+	data_t             *directory = NULL;
+	bctx_t             *bctx = NULL;
+
+	GF_VALIDATE_OR_GOTO ("bdb", this, out);
+
+	_private = CALLOC (1, sizeof (*_private));
+	GF_VALIDATE_OR_GOTO (this->name, _private, out);
+
+	if (this->children) {
+		gf_log (this->name,
+			GF_LOG_ERROR,
+			"FATAL: storage/bdb cannot have subvolumes");
+		FREE (_private);
+		goto out;;
+	}
+
+	if (!this->parents) {
+		gf_log (this->name, GF_LOG_WARNING,
+			"dangling volume. check volfile ");
+	}
+
+	directory = dict_get (this->options, "directory");
+	if (!directory) {
+		gf_log (this->name, GF_LOG_ERROR,
+			"export directory not specified in volfile");
+		FREE (_private);
+		goto out;
+	} 
+	umask (000); // umask `masking' is done at the client side
+	/* // * No need to create directory, sys admin should do it himself 
+	if (mkdir (directory->data, 0777) == 0) {
+		gf_log (this->name, GF_LOG_WARNING,
+			"directory specified not exists, created");
+	}
+	*/
+  
+	/* Check whether the specified directory exists, if not create it. */
+	ret = stat (directory->data, &buf);
+	if ((ret != 0) || !S_ISDIR (buf.st_mode)) {
+		gf_log (this->name, GF_LOG_ERROR, 
+			"specified directory '%s' doesn't exists, Exiting", directory->data);
+		FREE (_private);
+		goto out;
+	} else {
+		ret = 0;
+	}
+
+
+	_private->export_path = strdup (directory->data);
+	_private->export_path_length = strlen (_private->export_path);
+
+	{
+		/* Stats related variables */
+		gettimeofday (&_private->init_time, NULL);
+		gettimeofday (&_private->prev_fetch_time, NULL);
+		_private->max_read = 1;
+		_private->max_write = 1;
+	}
+
+	this->private = (void *)_private;
+	{
+		ret = bdb_db_init (this, this->options);
+    
+		if (ret == -1){
+			gf_log (this->name,
+				GF_LOG_DEBUG,
+				"failed to initialize database");
+			goto out;
+		} else {
+			bctx = bctx_lookup (_private->b_table, "/");
+			/* NOTE: we are not doing bctx_unref() for root bctx, 
+			 *      let it remain in active list forever */
+			if (!bctx) {
+				gf_log (this->name,
+					GF_LOG_ERROR,
+					"failed to allocate memory for root (/) bctx: out of memory");
+				goto out;
+			} else {
+				ret = 0;
+			}
+		}
+	}
+out:
+	return ret;
+}
+
+void 
+bctx_cleanup (struct list_head *head)
+{
+	bctx_t *trav    = NULL;
+	bctx_t *tmp     = NULL;
+	DB     *storage = NULL;
+
+	list_for_each_entry_safe (trav, tmp, head, list) {
+		LOCK (&trav->lock);
+		storage = trav->dbp;
+		trav->dbp = NULL;
+		list_del_init (&trav->list);
+		UNLOCK (&trav->lock);
+    
+		if (storage) {
+			storage->close (storage, 0);
+			storage = NULL;
+		}
+	}
+  	return;
+}
+
+void
+fini (xlator_t *this)
+{
+	struct bdb_private *private = NULL; 
+	int32_t             idx     = 0;
+	int32_t             ret     = 0;
+	private = this->private;
+
+	if (B_TABLE(this)) {
+		/* close all the dbs from lru list */
+		bctx_cleanup (&(B_TABLE(this)->b_lru));
+		for (idx = 0; idx < B_TABLE(this)->hash_size; idx++)
+			bctx_cleanup (&(B_TABLE(this)->b_hash[idx]));
+    
+		if (BDB_ENV(this)) {
+			LOCK (&private->active_lock);
+			private->active = 0;
+			UNLOCK (&private->active_lock);
+       
+			ret = pthread_join (private->checkpoint_thread, NULL);
+			if (ret != 0) {
+				gf_log (this->name,
+					GF_LOG_CRITICAL,
+					"failed to join checkpoint thread");
+			}
+
+			/* TODO: pick each of the 'struct bctx' from private->b_hash
+			 * and close all the databases that are open */
+			BDB_ENV(this)->close (BDB_ENV(this), 0);
+		} else {
+			/* impossible to reach here */
+		}
+
+		FREE (B_TABLE(this));
+	}
+	FREE (private);
+	return;
+}
+
+struct xlator_mops mops = {
+	.stats    = bdb_stats,
+};
+
+struct xlator_fops fops = {
+	.lookup      = bdb_lookup,
+	.stat        = bdb_stat,
+	.opendir     = bdb_opendir,
+	.readdir     = bdb_readdir,
+	.readlink    = bdb_readlink,
+	.mknod       = bdb_mknod,
+	.mkdir       = bdb_mkdir,
+	.unlink      = bdb_unlink,
+	.rmdir       = bdb_rmdir,
+	.symlink     = bdb_symlink,
+	.rename      = bdb_rename,
+	.link        = bdb_link,
+	.chmod       = bdb_chmod,
+	.chown       = bdb_chown,
+	.truncate    = bdb_truncate,
+	.utimens     = bdb_utimens,
+	.create      = bdb_create,
+	.open        = bdb_open,
+	.readv       = bdb_readv,
+	.writev      = bdb_writev,
+	.statfs      = bdb_statfs,
+	.flush       = bdb_flush,
+	.fsync       = bdb_fsync,
+	.setxattr    = bdb_setxattr,
+	.getxattr    = bdb_getxattr,
+	.removexattr = bdb_removexattr,
+	.fsyncdir    = bdb_fsyncdir,
+	.access      = bdb_access,
+	.ftruncate   = bdb_ftruncate,
+	.fstat       = bdb_fstat,
+	.lk          = bdb_lk,
+	.inodelk     = bdb_inodelk,
+	.finodelk    = bdb_finodelk,
+	.entrylk     = bdb_entrylk,
+	.fentrylk    = bdb_fentrylk,
+	.fchown      = bdb_fchown,
+	.fchmod      = bdb_fchmod,
+	.setdents    = bdb_setdents,
+	.getdents    = bdb_getdents,
+	.checksum    = bdb_checksum,
+};
+
+struct xlator_cbks cbks = {
+	.release    = bdb_release,
+	.releasedir = bdb_releasedir
+};
+
+#if 0
+struct volume_options options[] = {
+	{ "directory", GF_OPTION_TYPE_PATH, 0, },
+	{ "logdir", GF_OPTION_TYPE_PATH, 0, },
+	{ "errfile", GF_OPTION_TYPE_PATH, 0, },
+	{ "dir-mode", GF_OPTION_TYPE_ANY, 0, },  // base 8 number 
+	{ "file-mode", GF_OPTION_TYPE_ANY, 0, }, // base 8 number
+	{ "page-size", GF_OPTION_TYPE_SIZET, -1, },
+	{ "lru-limit", GF_OPTION_TYPE_INT, -1, },
+	{ "lock-timeout", GF_OPTION_TYPE_TIME, 0, },
+	{ "checkpoint-timeout", GF_OPTION_TYPE_TIME, 0, },
+	{ "transaction-timeout", GF_OPTION_TYPE_TIME, 0, },
+	{ "mode", GF_OPTION_TYPE_BOOL, 0, }, // Should be 'cache' ?? 
+	{ "access-mode", GF_OPTION_TYPE_STR, 0, 0, 0, "btree"},
+	{ NULL, 0, }
+};
+
+#endif /* #if 0 */
diff --git a/xlators/storage/bdb/src/bdb.h b/xlators/storage/bdb/src/bdb.h
new file mode 100644
index 00000000000..f2d962680dd
--- /dev/null
+++ b/xlators/storage/bdb/src/bdb.h
@@ -0,0 +1,439 @@
+/*
+  Copyright (c) 2008, 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 _BDB_H
+#define _BDB_H
+
+#ifndef _CONFIG_H
+#define _CONFIG_H
+#include "config.h"
+#endif
+
+#include <stdio.h>
+#include <dirent.h>
+#include <unistd.h>
+#include <sys/types.h>
+#include <dirent.h>
+
+#include <db.h>
+
+#ifdef linux
+#ifdef __GLIBC__
+#include <sys/fsuid.h>
+#else
+#include <unistd.h>
+#endif
+#endif
+
+#ifdef HAVE_SYS_XATTR_H
+#include <sys/xattr.h>
+#endif
+
+#ifdef HAVE_SYS_EXTATTR_H
+#include <sys/extattr.h>
+#endif
+
+#include <pthread.h>
+#include "xlator.h"
+#include "inode.h"
+#include "compat.h"
+#include "compat-errno.h"
+
+#define GLFS_BDB_STORAGE    "/glusterfs_storage.db"
+
+/* numbers are not so reader-friendly, so lets have ON and OFF macros */
+#define ON  1
+#define OFF 0
+
+#define BDB_DEFAULT_LRU_LIMIT 100
+#define BDB_DEFAULT_HASH_SIZE 100
+
+#define BDB_ENOSPC_THRESHOLD 25600
+
+#define BDB_DEFAULT_CHECKPOINT_TIMEOUT 30
+
+#define BCTX_ENV(bctx) (bctx->table->dbenv)
+/* MAKE_REAL_PATH(var,this,path)
+ * make the real path on the underlying file-system
+ *
+ * @var:  destination to hold the real path
+ * @this: pointer to xlator_t corresponding to bdb xlator 
+ * @path: path, as seen from mount-point 
+ */
+#define MAKE_REAL_PATH(var, this, path) do {				\
+		int base_len = ((struct bdb_private *)this->private)->export_path_length; \
+		var = alloca (strlen (path) + base_len + 2);		\
+		strcpy (var, ((struct bdb_private *)this->private)->export_path); \
+		strcpy (&var[base_len], path);				\
+	} while (0)
+
+/* MAKE_REAL_PATH_TO_STORAGE_DB(var,this,path)
+ * make the real path to the storage-database file on file-system
+ *
+ * @var:  destination to hold the real path
+ * @this: pointer to xlator_t corresponding to bdb xlator 
+ * @path: path of the directory, as seen from mount-point 
+ */
+#define MAKE_REAL_PATH_TO_STORAGE_DB(var, this, path) do {		\
+		int base_len = ((struct bdb_private *)this->private)->export_path_length; \
+		var = alloca (strlen (path) + base_len + strlen (GLFS_BDB_STORAGE)); \
+		strcpy (var, ((struct bdb_private *)this->private)->export_path); \
+		strcpy (&var[base_len], path);				\
+		strcat (var, GLFS_BDB_STORAGE);				\
+	} while (0)
+
+/* MAKE_KEY_FROM_PATH(key,path)
+ * make a 'key', which we use as key in the underlying database by using the path
+ *
+ * @key:  destination to hold the key
+ * @path: path to file as seen from mount-point 
+ */
+#define MAKE_KEY_FROM_PATH(key, path) do {		\
+		char *tmp = alloca (strlen (path));	\
+		strcpy (tmp, path);			\
+		key = basename (tmp);			\
+	}while (0);
+
+/* BDB_DO_LSTAT(path,stbuf,dirent)
+ * construct real-path to a dirent and do lstat on the real-path
+ *
+ * @path:   path to the directory whose readdir is currently in progress
+ * @stbuf:  a 'struct stat *'
+ * @dirent: a 'struct dirent *'
+ */
+#define BDB_DO_LSTAT(path, stbuf, dirent) do {		\
+		char tmp_real_path[GF_PATH_MAX];	\
+		strcpy(tmp_real_path, path);		\
+		strcat (tmp_real_path, "/");		\
+		strcat(tmp_real_path, dirent->d_name);	\
+		ret = lstat (tmp_real_path, stbuf);	\
+	} while(0);
+
+/* IS_BDB_PRIVATE_FILE(name)
+ * check if a given 'name' is bdb xlator's internal file name 
+ *
+ * @name: basename of a file.
+ *
+ * bdb xlator reserves file names 'glusterfs_storage.db', 
+ * 'glusterfs_ns.db'(used by bdb xlator itself), 'log.*', '__db.*' (used by libdb)
+ */
+#define IS_BDB_PRIVATE_FILE(name) ((!strncmp(name, "__db.", 5)) ||	      \
+                                   (!strcmp(name, "glusterfs_storage.db")) || \
+                                   (!strcmp(name, "glusterfs_ns.db")) ||      \
+                                   (!strncmp(name, "log.0000", 8)))
+
+/* check if 'name' is '.' or '..' entry */
+#define IS_DOT_DOTDOT(name) ((!strncmp(name,".", 1)) || (!strncmp(name,"..", 2)))
+
+/* BDB_SET_BCTX(this,inode,bctx)
+ * put a stamp on inode. d00d, you are using bdb.. huhaha.
+ * pointer to 'struct bdb_ctx' is stored in inode's ctx of all directories. 
+ * this will happen either in lookup() or mkdir().
+ *
+ * @this:  pointer xlator_t of bdb xlator.
+ * @inode: inode where 'struct bdb_ctx *' has to be stored.
+ * @bctx:  a 'struct bdb_ctx *'
+ */
+#define BDB_SET_BCTX(this,inode,bctx) do{                         \
+		inode_ctx_put(inode, this, (uint64_t)(long)bctx); \
+	}while (0);
+
+/* MAKE_BCTX_FROM_INODE(this,bctx,inode)
+ * extract bdb xlator's 'struct bdb_ctx *' from an inode's ctx.
+ * valid only if done for directory inodes, otherwise bctx = NULL.
+ *
+ * @this:  pointer xlator_t of bdb xlator.
+ * @bctx:  a 'struct bdb_ctx *'
+ * @inode: inode from where 'struct bdb_ctx *' has to be extracted. 
+ */
+#define MAKE_BCTX_FROM_INODE(this,bctx,inode) do{        \
+                uint64_t tmp_bctx = 0;                   \
+                inode_ctx_get (inode, this, &tmp_bctx);  \
+                if (ret == 0)                            \
+		        bctx = (void *)(long)tmp_bctx;   \
+	}while (0);
+
+#define BDB_SET_BFD(this,fd,bfd) do{		            \
+		fd_ctx_set (fd, this, (uint64_t)(long)bfd); \
+	}while (0);
+
+/* maximum number of open dbs that bdb xlator will ever have */
+#define BDB_MAX_OPEN_DBS 100
+
+/* convert file size to block-count */
+#define BDB_COUNT_BLOCKS(size,blksize) (((size + blksize - 1)/blksize) - 1)
+
+/* file permissions, again macros are more readable */
+#define RWXRWXRWX         0777
+#define DEFAULT_FILE_MODE 0644
+#define DEFAULT_DIR_MODE  0755
+
+/* see, if have a valid file permissions specification in @mode */
+#define IS_VALID_FILE_MODE(mode) (!(mode & (~RWXRWXRWX)))
+#define IS_VALID_DIR_MODE(mode)  (!(mode & (~(RWXRWXRWX)))
+
+/* maximum retries for a failed transactional operation */		  
+#define BDB_MAX_RETRIES 10
+
+typedef struct bctx_table bctx_table_t;
+typedef struct bdb_ctx    bctx_t;
+typedef struct bdb_cache  bdb_cache_t;
+typedef struct bdb_private bdb_private_t;
+			 
+struct bctx_table {
+	uint64_t            dbflags;         /* flags to be used for opening each database */
+	uint64_t            cache;           /* cache: can be either ON or OFF */
+	gf_lock_t           lock;            /* used to lock the 'struct bctx_table *' */
+	gf_lock_t           checkpoint_lock; /* lock for checkpointing */
+	struct list_head   *b_hash;          /* hash table of 'struct bdb_ctx' */
+	struct list_head    active;          /* list of active 'struct bdb_ctx' */
+	struct list_head    b_lru;           /* lru list of inactive 'struct bdb_ctx' */
+	struct list_head    purge;
+	uint32_t            lru_limit;
+	uint32_t            lru_size;
+	uint32_t            hash_size;
+	DBTYPE              access_mode;     /* access mode for accessing the databases, 
+					      * can be DB_HASH, DB_BTREE */
+	DB_ENV             *dbenv;           /* DB_ENV under which every db operation
+					      * is carried over */
+	int32_t             transaction;
+	xlator_t           *this;
+
+	uint64_t            page_size;       /* page-size of DB, 
+					      * DB->set_pagesize(), should be set before DB->open */
+};
+
+struct bdb_ctx {
+	/* controller members */
+	struct list_head   list;        /* lru list of 'struct bdb_ctx's, 
+					 * a bdb_ctx can exist in one of b_hash or lru lists */
+	struct list_head   b_hash;      /* directory 'name' hashed list of 'struct bdb_ctx's */
+
+	struct bctx_table *table;
+	int32_t            ref;         /* reference count */
+	gf_lock_t          lock;        /* used to lock this 'struct bdb_ctx' */
+
+	char              *directory;   /* directory path */
+	DB                *dbp;         /* pointer to open database, that resides inside this directory */
+	uint32_t           cache;       /* cache ON or OFF */
+
+	/* per directory cache, bdb xlator's internal cache */
+	struct list_head   c_list;      /* linked list of cached records */
+	int32_t            c_count;     /* number of cached records */
+
+	int32_t            key_hash;    /* index to hash table list, to which this ctx belongs */
+	char              *db_path;     /* absolute path to db file */
+};
+
+struct bdb_fd {
+	struct bdb_ctx *ctx;            /* pointer to bdb_ctx of the parent directory */
+	char           *key;            /* name of the file. NOTE: basename, not the complete path */
+	int32_t         flags;          /* open flags */
+};
+
+struct bdb_dir {
+	struct bdb_ctx *ctx;              /* pointer to bdb_ctx of this directory */
+	DIR            *dir;              /* open directory pointer, as returned by opendir() */
+	char            offset[NAME_MAX]; /* FIXME: readdir offset, too crude. must go  */
+	char           *path;             /* path to this directory */
+};
+
+/* cache */
+struct bdb_cache {
+	struct list_head c_list;          /* list of 'struct bdb_cache' under a 'struct bdb_ctx' */
+	char            *key;             /* name of the file this cache holds. NOTE: basename of file */
+	char            *data;            /* file content */
+	size_t           size;            /* size of the file content that this cache holds */
+};
+
+
+struct bdb_private {
+	inode_table_t      *itable;             /* pointer to inode table that we use */
+	int32_t             temp;               /**/
+	char                is_stateless;       /**/
+	char               *export_path;        /* path to the export directory
+						 * (option directory <export-path>) */
+	int32_t             export_path_length; /* length of 'export_path' string */
+
+	/* statistics */
+	struct xlator_stats stats;              /* Statistics, provides activity of the server */
+  
+	struct timeval      prev_fetch_time;
+	struct timeval      init_time;
+	int32_t             max_read;           /* */
+	int32_t             max_write;          /* */
+	int64_t             interval_read;      /* Used to calculate the max_read value */
+	int64_t             interval_write;     /* Used to calculate the max_write value */
+	int64_t             read_value;         /* Total read, from init */
+	int64_t             write_value;        /* Total write, from init */
+  
+	/* bdb xlator specific private data */
+	uint64_t            envflags;              /* flags used for opening DB_ENV for this xlator */ 
+	uint64_t            dbflags;               /* flags to be used for opening each database */
+	uint64_t            cache;                 /* cache: can be either ON or OFF */
+	uint32_t            transaction;           /* transaction: can be either ON or OFF */
+	uint32_t active;
+	gf_lock_t active_lock;
+	struct bctx_table  *b_table;
+	DBTYPE              access_mode;           /* access mode for accessing the databases, 
+						    * can be DB_HASH, DB_BTREE 
+						    * (option access-mode <mode>) */
+	mode_t              file_mode;             /* mode for each and every file stored on bdb 
+						    * (option file-mode <mode>) */
+	mode_t              dir_mode;              /* mode for each and every directory stored on bdb 
+						    * (option dir-mode <mode>) */
+	mode_t              symlink_mode;          /* mode for each and every symlink stored on bdb */
+	pthread_t           checkpoint_thread;     /* pthread_t object used for creating checkpoint
+						    * thread */
+	int32_t             checkpoint_timeout;    /* time duration between two consecutive checkpoint
+						    * operations.
+						    * (option checkpoint-timeout <time-in-seconds>) */
+	ino_t               next_ino;              /* inode number allocation counter */
+	gf_lock_t           ino_lock;              /* lock to protect 'next_ino' */
+	char               *logdir;                /* environment log directory
+						    * (option logdir <directory>) */
+	char               *errfile;               /* errfile path, used by environment to
+						    * print detailed error log.
+						    * (option errfile <errfile-path>) */
+	FILE               *errfp;                 /* DB_ENV->set_errfile() expects us to fopen
+						    * the errfile before doing DB_ENV->set_errfile() */
+	uint32_t            txn_timeout;           /* used by DB_ENV->set_timeout to set the timeout for
+						    * a transactionally encapsulated DB->operation() to
+						    * timeout before waiting for locks to be released.
+						    * (option transaction-timeout <time-in-milliseconds>) 
+						    */
+	uint32_t            lock_timeout;
+	uint32_t            log_auto_remove;        /* DB_AUTO_LOG_REMOVE flag for DB_ENV*/
+	uint32_t            log_region_max;
+};
+
+
+static inline int32_t 
+bdb_txn_begin (DB_ENV *dbenv,
+	       DB_TXN **ptxnid)
+{
+	return dbenv->txn_begin (dbenv, NULL, ptxnid, 0);
+}
+
+static inline int32_t
+bdb_txn_abort (DB_TXN *txnid)
+{
+	return txnid->abort (txnid);
+}
+
+static inline int32_t
+bdb_txn_commit (DB_TXN *txnid)
+{
+	return txnid->commit (txnid, 0);
+}
+
+inline void *
+bdb_extract_bfd (fd_t *fd, xlator_t *this);
+
+
+void *
+bdb_db_stat (bctx_t *bctx, 
+	     DB_TXN *txnid,
+	     uint32_t flags);
+
+int32_t
+bdb_db_get(struct bdb_ctx *bctx,
+	   DB_TXN *txnid,
+	   const char *key_string,
+	   char **buf,
+	   size_t size,
+	   off_t offset);
+
+#define BDB_TRUNCATE_RECORD 0xcafebabe
+
+int32_t
+bdb_db_put (struct bdb_ctx *bctx,
+	    DB_TXN *txnid,
+	    const char *key_string,
+	    const char *buf,
+	    size_t size,
+	    off_t offset,
+	    int32_t flags);
+
+int32_t
+bdb_db_del (struct bdb_ctx *bctx,
+	    DB_TXN *txnid,
+	    const char *path);
+
+ino_t
+bdb_inode_transform (ino_t parent,
+		     struct bdb_ctx *bctx);
+
+
+int32_t
+bdb_cursor_open (struct bdb_ctx *bctx,
+		 DBC **cursorp);
+
+int32_t
+bdb_cursor_get (DBC *cursorp,
+		DBT *key,
+		DBT *value,
+		int32_t flags);
+
+
+int32_t
+bdb_cursor_close (struct bdb_ctx *ctx,
+		  DBC *cursorp);
+
+
+int32_t
+bdb_dirent_size (DBT *key);
+
+int32_t
+dirent_size (struct dirent *entry);
+
+int
+bdb_db_init (xlator_t *this,
+	     dict_t *options);
+
+void
+bdb_dbs_from_dict_close (dict_t *this,
+			 char *key,
+			 data_t *value,
+			 void *data);
+
+bctx_t *
+bctx_lookup (struct bctx_table *table,
+	     const char *path);
+
+bctx_t *
+bctx_parent
+(struct bctx_table *table,
+ const char *path);
+
+bctx_t *
+bctx_unref (bctx_t *ctx);
+
+bctx_t *
+bctx_ref (bctx_t *ctx);
+
+bctx_t *
+bctx_rename (bctx_t *bctx, 
+	     const char *db_newpath);
+
+int32_t
+bdb_db_rename (bctx_table_t *table, 
+	       const char *tmp_db_newpath, 
+	       const char *real_db_newpath);
+#endif /* _BDB_H */