linux-ext4 - [PATCH 20/47] libext2fs: Introduce dx_tail and dir_entry

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Date:	Sat, 08 Oct 2011 00:35:23 -0700
From:	"Darrick J. Wong" <djwong@...ibm.com>
To:	Andreas Dilger <adilger.kernel@...ger.ca>,
	Theodore Tso <tytso@....edu>,
	"Darrick J. Wong" <djwong@...ibm.com>
Cc:	Sunil Mushran <sunil.mushran@...cle.com>,
	Amir Goldstein <amir73il@...il.com>,
	Andi Kleen <andi@...stfloor.org>,
	Mingming Cao <cmm@...ibm.com>,
	Joel Becker <jlbec@...lplan.org>, linux-ext4@...r.kernel.org,
	Coly Li <colyli@...il.com>
Subject: [PATCH 20/47] libext2fs: Introduce dx_tail and dir_entry_tail

Introduce small structures for recording directory tree checksums

Signed-off-by: Darrick J. Wong <djwong@...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

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