linux-ext4 - [PATCH 02/50] libext2fs: Add metadata checksum flag

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Message-ID: <20111129002809.17953.92292.stgit@elm3c44.beaverton.ibm.com>
Date:	Mon, 28 Nov 2011 16:28:09 -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 02/50] libext2fs: Add metadata checksum flag

Add a feature flag to enable metadata checksumming in e2fsprogs.  Also add a
runtime flag to disable checksum verification; this flag will be used by
debugfs to salvage filesystems and tune2fs when resetting checksums.

Signed-off-by: Darrick J. Wong <djwong@...ibm.com>
---
 lib/blkid/probe.h   |    1 +
 lib/ext2fs/ext2fs.h |    7 +++++--
 2 files changed, 6 insertions(+), 2 deletions(-)


diff --git a/lib/blkid/probe.h b/lib/blkid/probe.h
index 37e80ef..d6809e1 100644
--- a/lib/blkid/probe.h
+++ b/lib/blkid/probe.h
@@ -110,6 +110,7 @@ struct ext2_super_block {
 #define EXT4_FEATURE_RO_COMPAT_DIR_NLINK	0x0020
 #define EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE	0x0040
 #define EXT4_FEATURE_RO_COMPAT_QUOTA		0x0100
+#define EXT4_FEATURE_RO_COMPAT_METADATA_CSUM	0x0400
 
 /* for s_feature_incompat */
 #define EXT2_FEATURE_INCOMPAT_FILETYPE		0x0002
diff --git a/lib/ext2fs/ext2fs.h b/lib/ext2fs/ext2fs.h
index 08f1946..4ff7f4f 100644
--- a/lib/ext2fs/ext2fs.h
+++ b/lib/ext2fs/ext2fs.h
@@ -199,6 +199,7 @@ typedef struct ext2_file *ext2_file_t;
 #define EXT2_FLAG_PRINT_PROGRESS	0x40000
 #define EXT2_FLAG_DIRECT_IO		0x80000
 #define EXT2_FLAG_SKIP_MMP		0x100000
+#define EXT2_FLAG_IGNORE_CSUM_ERRORS	0x200000
 
 /*
  * Special flag in the ext2 inode i_flag field that means that this is
@@ -585,7 +586,8 @@ typedef struct ext2_icount *ext2_icount_t;
 					 EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE|\
 					 EXT4_FEATURE_RO_COMPAT_GDT_CSUM|\
 					 EXT4_FEATURE_RO_COMPAT_BIGALLOC|\
-					 EXT4_FEATURE_RO_COMPAT_QUOTA)
+					 EXT4_FEATURE_RO_COMPAT_QUOTA|\
+					 EXT4_FEATURE_RO_COMPAT_METADATA_CSUM)
 #else
 #define EXT2_LIB_FEATURE_RO_COMPAT_SUPP	(EXT2_FEATURE_RO_COMPAT_SPARSE_SUPER|\
 					 EXT4_FEATURE_RO_COMPAT_HUGE_FILE|\
@@ -593,7 +595,8 @@ typedef struct ext2_icount *ext2_icount_t;
 					 EXT4_FEATURE_RO_COMPAT_DIR_NLINK|\
 					 EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE|\
 					 EXT4_FEATURE_RO_COMPAT_GDT_CSUM|\
-					 EXT4_FEATURE_RO_COMPAT_BIGALLOC)
+					 EXT4_FEATURE_RO_COMPAT_BIGALLOC|\
+					 EXT4_FEATURE_RO_COMPAT_METADATA_CSUM)
 #endif
 
 /*

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