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ext4: calculate and verify superblock checksum

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Calculate and verify the superblock checksum.  Since the UUID and
block group number are embedded in each copy of the superblock, we
need only checksum the entire block.  Refactor some of the code to
eliminate open-coding of the checksum update call.

Signed-off-by: Darrick J. Wong <djwong@us.ibm.com>
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
This commit is contained in:
Darrick J. Wong
2012-04-29 18:29:10 -04:00
committed by Theodore Ts'o
parent 0441984a33
commit a9c4731780
7 changed files with 76 additions and 7 deletions
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9
fs/ext4/ext4_jbd2.c
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@@ -138,16 +138,23 @@ int __ext4_handle_dirty_metadata(const char *where, unsigned int line,
}
int __ext4_handle_dirty_super(const char *where, unsigned int line,
handle_t *handle, struct super_block *sb)
handle_t *handle, struct super_block *sb,
int now)
{
struct buffer_head *bh = EXT4_SB(sb)->s_sbh;
int err = 0;
if (ext4_handle_valid(handle)) {
ext4_superblock_csum_set(sb,
(struct ext4_super_block *)bh->b_data);
err = jbd2_journal_dirty_metadata(handle, bh);
if (err)
ext4_journal_abort_handle(where, line, __func__,
bh, handle, err);
} else if (now) {
ext4_superblock_csum_set(sb,
(struct ext4_super_block *)bh->b_data);
mark_buffer_dirty(bh);
} else
sb->s_dirt = 1;
return err;