linux-ext4 - [PATCH 09/51] mke2fs: Allow metadata checksums to be turned on at mkfs time

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Message-ID: <20120107083354.25788.49388.stgit@elm3c44.beaverton.ibm.com>
Date:	Sat, 07 Jan 2012 00:33:54 -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 09/51] mke2fs: Allow metadata checksums to be turned on at
	mkfs time

Write out reserved inodes with full checksums when writing out a zeroed table.

Signed-off-by: Darrick J. Wong <djwong@...ibm.com>
---
 misc/mke2fs.c |   29 ++++++++++++++++++++++++++++-
 1 files changed, 28 insertions(+), 1 deletions(-)


diff --git a/misc/mke2fs.c b/misc/mke2fs.c
index f2d7c81..7888a2f 100644
--- a/misc/mke2fs.c
+++ b/misc/mke2fs.c
@@ -305,6 +305,27 @@ _("Warning: the backup superblock/group descriptors at block %u contain\n"
 	ext2fs_badblocks_list_iterate_end(bb_iter);
 }
 
+static void write_reserved_inodes(ext2_filsys fs)
+{
+	errcode_t	retval;
+	ext2_ino_t	ino;
+	struct ext2_inode *inode;
+
+	retval = ext2fs_get_mem(EXT2_INODE_SIZE(fs->super), &inode);
+	if (retval) {
+		com_err("inode_init", retval,
+			"while allocating memory");
+		exit(1);
+	}
+	bzero(inode, EXT2_INODE_SIZE(fs->super));
+
+	for (ino = 1; ino < EXT2_FIRST_INO(fs->super); ino++)
+		ext2fs_write_inode_full(fs, ino, inode,
+					EXT2_INODE_SIZE(fs->super));
+
+	ext2fs_free_mem(&inode);
+}
+
 static void write_inode_tables(ext2_filsys fs, int lazy_flag, int itable_zeroed)
 {
 	errcode_t	retval;
@@ -350,6 +371,12 @@ static void write_inode_tables(ext2_filsys fs, int lazy_flag, int itable_zeroed)
 	ext2fs_zero_blocks2(0, 0, 0, 0, 0);
 	ext2fs_numeric_progress_close(fs, &progress,
 				      _("done                            \n"));
+
+	/* Reserved inodes must always have correct checksums */
+	if (fs->super->s_creator_os == EXT2_OS_LINUX &&
+	    fs->super->s_feature_ro_compat &
+	    EXT4_FEATURE_RO_COMPAT_METADATA_CSUM)
+		write_reserved_inodes(fs);
 }
 
 static void create_root_dir(ext2_filsys fs)
@@ -869,7 +896,7 @@ static __u32 ok_features[3] = {
 #ifdef CONFIG_QUOTA
 		EXT4_FEATURE_RO_COMPAT_QUOTA|
 #endif
-		0
+		EXT4_FEATURE_RO_COMPAT_METADATA_CSUM
 };
 
 

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