[PATCH 20/47] libext2fs: Introduce dx_tail and dir_entry_tail

["Darrick J. Wong" <djwong@us.ibm.com>]

Introduce small structures for recording directory tree checksums

Signed-off-by: Darrick J. Wong <djwong@us.ibm.com>
---
 lib/ext2fs/ext2_fs.h |    8 ++++++++
 1 files changed, 8 insertions(+), 0 deletions(-)


diff --git a/lib/ext2fs/ext2_fs.h b/lib/ext2fs/ext2_fs.h
index cdfc4a8..65d205a 100644
--- a/lib/ext2fs/ext2_fs.h
+++ b/lib/ext2fs/ext2_fs.h
@@ -241,6 +241,14 @@ struct ext2_dx_countlimit {
 	__u16 count;
 };
 
+/*
+ * This goes at the end of each htree block.  If you want to use the
+ * reserved field, you'll have to update the checksum code to include it.
+ */
+struct ext2_dx_tail {
+	__u32 reserved;
+	__u32 checksum;	/* crc32c(uuid+inum+dxblock) */
+};
 
 /*
  * Macro-instructions used to manage group descriptors