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>
diff --git a/fs/ext4/ioctl.c b/fs/ext4/ioctl.c
index 6eee255..feba55a 100644
--- a/fs/ext4/ioctl.c
+++ b/fs/ext4/ioctl.c
@@ -152,6 +152,13 @@
if (!inode_owner_or_capable(inode))
return -EPERM;
+ if (EXT4_HAS_RO_COMPAT_FEATURE(inode->i_sb,
+ EXT4_FEATURE_RO_COMPAT_METADATA_CSUM)) {
+ ext4_warning(sb, "Setting inode version is not "
+ "supported with metadata_csum enabled.");
+ return -ENOTTY;
+ }
+
err = mnt_want_write_file(filp);
if (err)
return err;