Date: Wed, 26 Mar 2025 14:36:45 -0400 From: Alexander Motin <mav@FreeBSD.org> To: Rick Macklem <rick.macklem@gmail.com>, Lionel Cons <lionelcons1972@gmail.com> Cc: Andrew Walker <awalker@ixsystems.com>, Konstantin Belousov <kib@freebsd.org>, freebsd-arch@freebsd.org, FreeBSD CURRENT <freebsd-current@freebsd.org>, Cedric Blancher <cedric.blancher@gmail.com> Subject: Re: RFC: Solaris style extended attributes for FreeBSD Message-ID: <b0ad5da2-c790-4d16-8185-c43985cd900b@FreeBSD.org> In-Reply-To: <CAM5tNy4S8h1nWNhLe7vVUAowAoYYdJ44RHNdeYLj06toeawEnQ@mail.gmail.com> References: <CAM5tNy6wkfPRUpkyHB3h6=fhJHf-eFSWWNdeHV5VLA_xG7pGDA@mail.gmail.com> <Z81ghZUaLYyrxxhd@kib.kiev.ua> <CAB5c7xpDGV0gZhxf7GRxxgH=yAy1xks-%2Bcsw8q=BAm-eh%2BPKDQ@mail.gmail.com> <CAM5tNy7AGQT2PDG9iztk-zTs=wS%2BJqXKAMUhG2gzHfUDdtwQMQ@mail.gmail.com> <CAPJSo4UomdX-e6W6%2BEQUwFcXzr58NMRoQhgec-Nwhi05qy7zCg@mail.gmail.com> <CAM5tNy4S8h1nWNhLe7vVUAowAoYYdJ44RHNdeYLj06toeawEnQ@mail.gmail.com>
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Hi Rick, On 25.03.2025 16:53, Rick Macklem wrote: > 3 - A lot of the changes need to go into OpenZFS and I have no idea what > their position will be? (Most of the changes are in the os/freebsd/zfs > source subtree, which may make it easier?) I haven't looked on the patches yet, and I may not speak for the whole OpenZFS project, but I'd put emphasis on a cross-OS compatibility of the implementation, including the properties, namespace prefixes for different APIs, etc. Since the directory-style attributes are growing from Solaris, it would be nice if whatever API and on-disk format chosen would be compatible with it. Even though the merge traffic with Illumos is not that big lately and they are formally not a part of OpenZFS, but would be nice to not break the ties if possible. It might require some code archeology to understand the evolution of compatibility issues we have now. FreeBSD and Linux are equally important targets in OpenZFS now, and while some things might be difficult to implement on all platforms, for example Linux kernel does not support NFSv4-style ACLs, whatever design chosen should allow such perspective, even if not implemented immediately. So I am a little worried about "Most of the changes are in the os/freebsd/zfs source subtree". We don't want it to get implemented differently in Linux one day and become impossible to move pools between OS'es. We already have issues there, so would be good to not grow them. While formally not a part of OpenZFS tree (yet?), there are forks for Windows and MacOS. It would be cool to understand at least basic requirements of those systems. Don't get me wrong. I'd be really happy to see it done at least from the perspective of its being implemented for Solaris decades ago, and considering limitations other systems including FreeBSD have. It just might be a bit tangled after the years. -- Alexander Motin
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