[lkml]   [2021]   [Feb]   [9]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
Messages in this thread
SubjectRe: [PATCH 1/2] ext4: Handle casefolding with encryption
On Wed, Feb 03, 2021 at 11:31:28AM -0500, Theodore Ts'o wrote:
> On Wed, Feb 03, 2021 at 03:55:06AM -0700, Andreas Dilger wrote:
> >
> > It looks like this change will break the dirdata feature, which is similarly
> > storing a data field beyond the end of the dirent. However, that feature also
> > provides for flags stored in the high bits of the type field to indicate
> > which of the fields are in use there.
> > The first byte of each field stores
> > the length, so it can be skipped even if the content is not understood.
> Daniel, for context, the dirdata field is an out-of-tree feature which
> is used by Lustre, and so has fairly large deployed base. So if there
> is a way that we can accomodate not breaking dirdata, that would be
> good.
> Did the ext4 casefold+encryption implementation escape out to any
> Android handsets?

So from an OOB chat with Daniel, it appears that the ext4
casefold+encryption implementation did in fact escape out to Android
handsets. So I think what we will need to do, ultiumately, is support
one way of supporting the casefold IV in the case where "encryption &&
casefold", and another way when "encryption && casefold && dirdata".

That's going to be a bit sucky, but I don't think it should be that
complex. Daniel, Andreas, does that make sense to you?

- Ted

 \ /
  Last update: 2021-02-10 02:36    [W:0.068 / U:2.520 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site