ecryptfs-devel team mailing list archive

[Dave Kleikamp <shaggy@xxxxxxxxxxxxxxxxxx>]

On Tue, 2009-01-20 at 00:25 +0900, hooanon05@xxxxxxxxxxx wrote:
> Dave Kleikamp:
> > > > For a regular file, the size of the upper inode is not the same as the
> > > > size of the lower inode.  The lower inode includes the header blocks
> > > > which are not visible in the upper inode.  So ecryptfs_interpose() will
> > > > overwrite the correct upper inode size.
> 	:::
> > It's restoring i_size to the correct value after ecryptfs_interpose
> > updates it with the wrong value.
> 
> Does "ecryptfs_interpose() will overwrite the correct upper inode size"
> means ecryptfs_interpose() sets a wrong value?

Yes.  ecryptfs_interpose() will copy the lower inode's size to the upper
inode.  For an encrypted file, the lower inode will have a larger size,
since the lower file is prefixed with a header.

> If so, I can understand why ecryptfs_link() sets i_size.

Shaggy
-- 
David Kleikamp
IBM Linux Technology Center