[TUHS] Portals in 4.4 BSD

[Tony Finch]

Ramakrishnan Muthukrishnan <ram at rkrishnan.org> wrote:
>
> I read with a lot of interest, an old Usenix paper by the late Richard
> Stevens on a system called "Portals": [...]
> Wondering if this survived in any existing, so called "modern" Unix.

A descendent of the original code is still present in DragonFlyBSD:

http://gitweb.dragonflybsd.org/dragonfly.git/tree/HEAD:/sys/vfs/portal
http://gitweb.dragonflybsd.org/dragonfly.git/tree/HEAD:/sbin/mount_portal

The facility still exists in NetBSD but it has been reimplemented on top
of puffs, the Pass-to-Userspace Framework File System development
interface.

http://netbsd.gw.com/cgi-bin/man-cgi?mount_portal

It survived in FreeBSD for a long time, but eventually was removed in 2012
rather than being made multiprocessor-safe.

https://github.com/freebsd/freebsd/commit/efcca33ac515c354e18135425794400ea32406a8

It also got removed from OpenBSD in 2011.

http://cvsweb.openbsd.org/cgi-bin/cvsweb/src/sbin/mount_portal/Attic/mount_portal.8

Tony.
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