ext4: calculate and verify inode checksums

This patch introduces to ext4 the ability to calculate and verify
inode checksums.  This requires the use of a new ro compatibility flag
and some accompanying e2fsprogs patches to provide the relevant
features in tune2fs and e2fsck.  The inode generation changes have
been integrated into this patch.

Signed-off-by: Darrick J. Wong <djwong@us.ibm.com>
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>

1 files changed, 3 insertions, 0 deletions

diff --git a/fs/ext4/ext4.h b/fs/ext4/ext4.h
index 5adbce519b66..ca96401b4b81 100644
--- a/fs/ext4/ext4.h
+++ b/fs/ext4/ext4.h
@@ -915,6 +915,9 @@ struct ext4_inode_info {
          */
         tid_t i_sync_tid;
         tid_t i_datasync_tid;
+
+        /* Precomputed uuid+inum+igen checksum for seeding inode checksums */
+        __u32 i_csum_seed;
 };
 
 /*