linux-ext4 - [PATCH 45/54] libext2fs: Dump feature flags for jbd2 v2 checksums

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Date:	Tue, 06 Mar 2012 16:02:42 -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 45/54] libext2fs: Dump feature flags for jbd2 v2 checksums

Modify the dump code to print information about jbd2 v2 checksum data.

Signed-off-by: Darrick J. Wong <djwong@...ibm.com>
---
 lib/e2p/feature.c |    2 ++
 misc/dumpe2fs.c   |   29 +++++++++++++++++++++++++++++
 2 files changed, 31 insertions(+), 0 deletions(-)


diff --git a/lib/e2p/feature.c b/lib/e2p/feature.c
index 19e6f0c..486f846 100644
--- a/lib/e2p/feature.c
+++ b/lib/e2p/feature.c
@@ -98,6 +98,8 @@ static struct feature jrnl_feature_list[] = {
                        "journal_incompat_revoke" },
        {       E2P_FEATURE_INCOMPAT, JFS_FEATURE_INCOMPAT_ASYNC_COMMIT,
                        "journal_async_commit" },
+       {       E2P_FEATURE_INCOMPAT, JFS_FEATURE_INCOMPAT_CSUM_V2,
+                       "journal_checksum_v2" },
        {       0, 0, 0 },
 };
 
diff --git a/misc/dumpe2fs.c b/misc/dumpe2fs.c
index 40398a7..3ceb0f8 100644
--- a/misc/dumpe2fs.c
+++ b/misc/dumpe2fs.c
@@ -311,6 +311,16 @@ static void list_bad_blocks(ext2_filsys fs, int dump)
 	ext2fs_badblocks_list_free(bb_list);
 }
 
+static char *journal_checksum_type_str(__u8 type)
+{
+	switch (type) {
+	case JBD2_CRC32C_CHKSUM:
+		return "crc32c";
+	default:
+		return "unknown";
+	}
+}
+
 static void print_inline_journal_information(ext2_filsys fs)
 {
 	journal_superblock_t	*jsb;
@@ -377,6 +387,15 @@ static void print_inline_journal_information(ext2_filsys fs)
 	       (unsigned int)ntohl(jsb->s_maxlen),
 	       (unsigned int)ntohl(jsb->s_sequence),
 	       (unsigned int)ntohl(jsb->s_start));
+	if (jsb->s_feature_compat &
+	    ext2fs_cpu_to_be32(JFS_FEATURE_COMPAT_CHECKSUM))
+		printf(_("Journal checksum type:    crc32\n"));
+	if (jsb->s_feature_incompat &
+	    ext2fs_cpu_to_be32(JFS_FEATURE_INCOMPAT_CSUM_V2))
+		printf(_("Journal checksum type:    %s\n"
+			 "Journal checksum:         0x%08x\n"),
+		       journal_checksum_type_str(jsb->s_checksum_type),
+		       ext2fs_be32_to_cpu(jsb->s_checksum));
 }
 
 static void print_journal_information(ext2_filsys fs)
@@ -402,6 +421,16 @@ static void print_journal_information(ext2_filsys fs)
 		exit(1);
 	}
 
+	if (jsb->s_feature_compat &
+	    ext2fs_cpu_to_be32(JFS_FEATURE_COMPAT_CHECKSUM))
+		printf(_("Journal checksum type:    crc32\n"));
+	if (jsb->s_feature_incompat &
+	    ext2fs_cpu_to_be32(JFS_FEATURE_INCOMPAT_CSUM_V2))
+		printf(_("Journal checksum type:    %s\n"
+			 "Journal checksum:         0x%08x\n"),
+		       journal_checksum_type_str(jsb->s_checksum_type),
+		       ext2fs_be32_to_cpu(jsb->s_checksum));
+
 	printf(_("\nJournal block size:       %u\n"
 		 "Journal length:           %u\n"
 		 "Journal first block:      %u\n"

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