linux-ext4 - [PATCH 22/51] debugfs: Print htree internal node checksums

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Message-ID: <20120107083516.25788.13047.stgit@elm3c44.beaverton.ibm.com>
Date:	Sat, 07 Jan 2012 00:35:16 -0800
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 22/51] debugfs: Print htree internal node checksums

Print htree node checksums when dumping a directory index.

Signed-off-by: Darrick J. Wong <djwong@...ibm.com>
---
 debugfs/htree.c |   17 ++++++++++++++++-
 1 files changed, 16 insertions(+), 1 deletions(-)


diff --git a/debugfs/htree.c b/debugfs/htree.c
index 05745eb..2fb804e 100644
--- a/debugfs/htree.c
+++ b/debugfs/htree.c
@@ -120,8 +120,9 @@ static void htree_dump_int_node(ext2_filsys fs, ext2_ino_t ino,
 {
 	struct ext2_dx_countlimit	limit;
 	struct ext2_dx_entry		e;
+	struct ext2_dx_tail		*tail;
 	int				hash, i;
-
+	int				remainder;
 
 	limit = *((struct ext2_dx_countlimit *) ent);
 	limit.count = ext2fs_le16_to_cpu(limit.count);
@@ -130,6 +131,20 @@ static void htree_dump_int_node(ext2_filsys fs, ext2_ino_t ino,
 	fprintf(pager, "Number of entries (count): %d\n", limit.count);
 	fprintf(pager, "Number of entries (limit): %d\n", limit.limit);
 
+	remainder = fs->blocksize - (limit.limit *
+				     sizeof(struct ext2_dx_entry));
+	if (ent == (struct ext2_dx_entry *)(rootnode + 1))
+		remainder -= sizeof(struct ext2_dx_root_info) + 24;
+	else
+		remainder -= 8;
+	if (EXT2_HAS_RO_COMPAT_FEATURE(fs->super,
+				       EXT4_FEATURE_RO_COMPAT_METADATA_CSUM) &&
+	    remainder == sizeof(struct ext2_dx_tail)) {
+		tail = (struct ext2_dx_tail *)(ent + limit.limit);
+		fprintf(pager, "Checksum: 0x%08x\n",
+			ext2fs_le32_to_cpu(tail->dt_checksum));
+	}
+
 	for (i=0; i < limit.count; i++) {
 		hash = i ? ext2fs_le32_to_cpu(ent[i].hash) : 0;
 		fprintf(pager, "Entry #%d: Hash 0x%08x%s, block %u\n", i,

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