Date: Wed, 6 Jun 2007 14:18:26 -0700 From: "Eric Lemar" <eric.lemar@isilon.com> To: "Kostik Belousov" <kostikbel@gmail.com>, "Roman Divacky" <rdivacky@freebsd.org> Cc: arch@freebsd.org Subject: RE: *at family of syscalls in FreeBSD Message-ID: <896DB1FBFFD5A145833D9DA08CA12A85051A83@seaxch07.desktop.isilon.com> References: <20070604162430.GA76813@freebsd.org> <896DB1FBFFD5A145833D9DA08CA12A85051A7F@seaxch07.desktop.isilon.com> <20070606074429.GA42032@freebsd.org> <20070606080328.GZ2268@deviant.kiev.zoral.com.ua>
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Ok, I'll get together a rough patch of what we are doing. Strict Posix = conformance wasn't a top priority and it's currently in a FreeBSD 6ish = branch, so I'm sure it will require at least a small amount of work to = be useful. Unfortunately there's a bit of other code to untangle this = from and (as always) other stuff to keep me from spending time = untangling, so it will probably be a few days before I get a chance to = put it together... =20 thanks, Eric Lemar ________________________________ From: Kostik Belousov [mailto:kostikbel@gmail.com] Sent: Wed 6/6/2007 1:03 AM To: Roman Divacky Cc: Eric Lemar; arch@freebsd.org Subject: Re: *at family of syscalls in FreeBSD On Wed, Jun 06, 2007 at 09:44:29AM +0200, Roman Divacky wrote: > On Tue, Jun 05, 2007 at 06:17:40PM -0700, Eric Lemar wrote: > > I'm definitely a fan of this API. Aside from the general = thread-related > > utility of this API, it provides a reasonable API for accessing > > windows-style ADS streams (subfiles) on a filesystem that supports = them > > and is becoming reasonably cross-platform. This lets you handle = things > > like ADS hanging off directories in a comparatively sane manner. > > > > We've actually implemented a subset of these syscalls in-house = (Isilon) > > for use with our filesystem, largely for the ADS-related = functionality. > > Generally speaking, in our tree most of the traditional non-'at' = syscalls > > are just small kernel wrappers around the 'at' interfaces. Overall = ends > > up looking fairly clean and we've ended up using them even in places > > where we don't need the ADS functionality just because they are so > > convenient. > > > > If you're interested in implementing this API I'd be happy to talk = about > > our implementation and see whether the relevant parts of our = implementation > > would be useful for the general community. > > my current patch is at: www.vlakno.cz/~rdivacky/linux_at.patch > > it does not implement the native fbsd syscalls, only the linuxulator = ones > but adding those is a matter of minutes. I asked for a review by pjd = and/or > rwatson and hopefully this will get commited soon.. I think it would be very useful to look at Isilon implementation, and = possibly merge your and their patch. In particular, it could give an insight of = what real uses for the API/KPI are.
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