Adding Libgfdb to GlusterFS

*************************************************************************
			Libgfdb						|
*************************************************************************
Libgfdb provides abstract mechanism to record extra/rich metadata
required for data maintenance, such as data tiering/classification.
It provides consumer with API for recording and querying, keeping
the consumer abstracted from the data store used beneath for storing data.
It works in a plug-and-play model, where data stores can be plugged-in.
Presently we have plugin for Sqlite3. In the future will provide recording
and querying performance optimizer. In the current implementation the schema
of metadata is fixed.

Schema:
~~~~~~
      GF_FILE_TB Table:
      ~~~~~~~~~~~~~~~~~
      This table has one entry per file inode. It holds the metadata required to
      make decisions in data maintenance.
      GF_ID (Primary key)	: File GFID (Universal Unique IDentifier in the namespace)
      W_SEC, W_MSEC 		: Write wind time in sec & micro-sec
      UW_SEC, UW_MSEC		: Write un-wind time in sec & micro-sec
      W_READ_SEC, W_READ_MSEC 	: Read wind time in sec & micro-sec
      UW_READ_SEC, UW_READ_MSEC : Read un-wind time in sec & micro-sec
      WRITE_FREQ_CNTR INTEGER	: Write Frequency Counter
      READ_FREQ_CNTR INTEGER	: Read Frequency Counter

      GF_FLINK_TABLE:
      ~~~~~~~~~~~~~~
      This table has all the hardlinks to a file inode.
      GF_ID		: File GFID               (Composite Primary Key)``|
      GF_PID		: Parent Directory GFID  (Composite Primary Key)   |-> Primary Key
      FNAME 		: File Base Name          (Composite Primary Key)__|
      FPATH 		: File Full Path (Its redundant for now, this will go)
      W_DEL_FLAG 	: This Flag is used for crash consistancy, when a link is unlinked.
                  	  i.e Set to 1 during unlink wind and during unwind this record
                          is deleted
      LINK_UPDATE 	: This Flag is used when a link is changed i.e rename.
                          Set to 1 when rename wind and set to 0 in rename unwind

Libgfdb API:
~~~~~~~~~~~
Refer libglusterfs/src/gfdb/gfdb_data_store.h

Change-Id: I2e9fbab3878ce630a7f41221ef61017dc43db11f
BUG: 1194753
Signed-off-by: Joseph Fernandes <josferna@redhat.com>
Signed-off-by: Dan Lambright <dlambrig@redhat.com>
Signed-off-by: Joseph Fernandes <josferna@redhat.com>
Reviewed-on: http://review.gluster.org/9683
Tested-by: Gluster Build System <jenkins@build.gluster.com>
Reviewed-by: Vijay Bellur <vbellur@redhat.com>

1 files changed, 64 insertions, 0 deletions

diff --git a/libglusterfs/src/gfdb/gfdb_sqlite3_helper.h b/libglusterfs/src/gfdb/gfdb_sqlite3_helper.h
new file mode 100644
index 00000000000..8b62be1d4d0
--- /dev/null
+++ b/libglusterfs/src/gfdb/gfdb_sqlite3_helper.h
@@ -0,0 +1,64 @@
+/*
+   Copyright (c) 2015 Red Hat, Inc. <http://www.redhat.com>
+   This file is part of GlusterFS.
+
+   This file is licensed to you under your choice of the GNU Lesser
+   General Public License, version 3 or any later version (LGPLv3 or
+   later), or the GNU General Public License, version 2 (GPLv2), in all
+   cases as published by the Free Software Foundation.
+*/
+#ifndef __GFDB_SQLITE3_HELPER_H
+#define __GFDB_SQLITE3_HELPER_H
+
+
+#ifndef _CONFIG_H
+#define _CONFIG_H
+#include "config.h"
+#endif
+
+#include "gfdb_sqlite3.h"
+
+/******************************************************************************
+ *
+ *                      Helper functions for gf_sqlite3_insert()
+ *
+ * ****************************************************************************/
+
+
+int
+gf_sql_insert_wind (gf_sql_connection_t  *sql_conn,
+                   gfdb_db_record_t     *gfdb_db_record);
+
+int
+gf_sql_insert_unwind (gf_sql_connection_t  *sql_conn,
+                     gfdb_db_record_t     *gfdb_db_record);
+
+
+int
+gf_sql_update_delete_wind (gf_sql_connection_t  *sql_conn,
+                          gfdb_db_record_t     *gfdb_db_record);
+
+int
+gf_sql_delete_unwind (gf_sql_connection_t  *sql_conn,
+                          gfdb_db_record_t     *gfdb_db_record);
+
+
+
+
+
+/******************************************************************************
+ *
+ *                      Find/Query helper functions
+ *
+ * ****************************************************************************/
+
+
+int
+gf_sql_query_function (sqlite3_stmt              *prep_stmt,
+                      gf_query_callback_t       query_callback,
+                      void                      *_query_cbk_args);
+
+int
+gf_sql_clear_counters (gf_sql_connection_t *sql_conn);
+
+#endif