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From: "Pedro F. Giffuni" <pfg@FreeBSD.org>
Date: Mon, 3 Jun 2013 18:52:14 +0000 (UTC)
To: src-committers@freebsd.org, svn-src-all@freebsd.org,
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Subject: svn commit: r251336 - head/sys/fs/ext2fs
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Author: pfg
Date: Mon Jun  3 18:52:14 2013
New Revision: 251336
URL: http://svnweb.freebsd.org/changeset/base/251336

Log:
  ext2fs: Update Block Group Descriptor struct.
  
  Uncover some, previously reserved, fields that are used by Ext4.
  These are currently unused but it is good to have them for future
  reference.
  
  Reviewed by:	bde
  MFC after:	3 days

Modified:
  head/sys/fs/ext2fs/ext2fs.h

Modified: head/sys/fs/ext2fs/ext2fs.h
==============================================================================
--- head/sys/fs/ext2fs/ext2fs.h	Mon Jun  3 18:51:34 2013	(r251335)
+++ head/sys/fs/ext2fs/ext2fs.h	Mon Jun  3 18:52:14 2013	(r251336)
@@ -281,9 +281,13 @@ struct ext2_gd {
 	uint32_t ext2bgd_i_tables;	/* inodes table block  */
 	uint16_t ext2bgd_nbfree;	/* number of free blocks */
 	uint16_t ext2bgd_nifree;	/* number of free inodes */
-	uint16_t ext2bgd_ndirs;	/* number of directories */
-	uint16_t reserved;
-	uint32_t reserved2[3];
+	uint16_t ext2bgd_ndirs;		/* number of directories */
+	uint16_t ext2bgd_flags;		/* block group flags */
+	uint32_t ext2bgd_x_bitmap;	/* snapshot exclusion bitmap loc. */
+	uint16_t ext2bgd_b_bmap_csum;	/* block bitmap checksum */
+	uint16_t ext2bgd_i_bmap_csum;	/* inode bitmap checksum */
+	uint16_t ext2bgd_i_unused;	/* unused inode count */
+	uint16_t ext2bgd_csum;		/* group descriptor checksum */
 };
 
 /* cluster summary information */