Yeah, I don't think we should surface these as xattrs. Xattrs are already way too small for most of the usecases of ADS on windows (file metadata for explorer etc) and they are also just an atomic blob and not a proper filedescriptor. Since ADS is still just a file, any application that in the future will use ADS features should only do so via a proper filedescriptors, where it is possible to seek/read/write/truncate/... so IMHO we shouldn't offer them an alternative but inferior API. Because they might mistakenly start to use it. :-( There are no real applications, yet, for linux that uses ADS but there are many that potentially could use ADS or become ADS aware. GUI Filebrowsers would be a nice usecase. As would making 'cp', 'mv', 'tar', 'rsync', ... ADS aware. So let's not do it with xattrs. No one needs/asks for this right now so it would be code we will have to maintain but has no users. What we should do though is think about and talk with the NTFS folks so that we make sure our aims and APIs will align with the plans they have. And once we have multiple filesystems supporting it (cifs.ko and ntfs) then we can start thinking about how to encourage external users and applications to use it. There are really nice use-cases for ADS where one can store additional metadata within the "file" itself. regards ronnie s On Tue, 23 May 2023 at 02:21, Jeremy Allison <jra@xxxxxxxxx> wrote: > > On Mon, May 22, 2023 at 01:39:50AM -0500, Steve French wrote: > >On Sun, May 21, 2023 at 11:33 PM ronnie sahlberg > ><ronniesahlberg@xxxxxxxxx> wrote: > >> > >> A problem we have with xattrs today is that we use EAs and these are > >> case insensitive. > >> Even worse I think windows may also convert the names to uppercase :-( > >> And there is no way to change it in the registry :-( > > > >But for alternate data streams if we allowed them to be retrieved via xattrs, > >would case sensitivity matter? Alternate data streams IIRC are already > >case preserving. Presumably the more common case is for a Linux user > >to read (or backup) an existing alternate data stream (which are usually > >created by Windows so case sensitivity would not be relevant). > > Warning Will Robinson ! Mixing ADS and xattrs on the client side is a receipe for > confusion and disaster IMHO. > > They really are different things. No good will come of trying to mix > the two into one client namespace.
