Re: [PATCH v8 00/41] Richacls

On Tue, Oct 6, 2015 at 11:49 AM, Christoph Hellwig [off-list ref] wrote:

On Mon, Oct 05, 2015 at 02:58:36PM -0400, Austin S Hemmelgarn wrote:

quoted

I think the point is that a new VFS feature that is easy to integrate in
multiple filesystems should have support for those filesystems.  A decade
ago, just having ext* support would probably have been fine, but these days,
XFS, BTRFS, and F2FS are used just as much (if not more) on production
systems as ext4, and having support for them right from the start would
significantly help with adoption of richacls.

That's one reason.  The other is that actually wiring it up for more
than a single consumer shows its actually reasonable generic.

The filesystem interface now is the same as for POSIX ACLs, used by a
dozen or so filesystems already.

 I don't want to end up with a situration like Posix ACLs again where
different file systems using different on disk formats again.

Any file system could choose a different on-disk format than the one
that ext4 currently uses, but I don't see a reason why any should.
Apart from uid / gid mappings that is the same as the user-space xattr
format. Network file systems like NFSv4 and CIFS with their predefined
over-the-wire formats obviously are another story.

Thanks,
Andreas